Any student who is not required to hand in written homework based on

This one is actually quite straightforward. Let’s first look at the conclusion:

“... if the students in a course are given several reading assignments and no written assignments, no student in that course will receive a high grade for the course”

The relationship between written homework and reading assignments is mentioned in the first sentence of the passage. Important to notice here is that having no mandatory written homework does not only lead in students not doing the writing but also in not even reading
the assigned text. This is the crucial link to answer this question right because - in real world circumstances - it would be quite logically to assume that even when there is no written homework students will still read the text to be able to receive a good grade in the exam.

Let’s look at (A):

(A) No student who completes anything less than all of the reading assignments for a course will earn a high grade for that course.

In line with pre thinking - bingo! How could the whole argument hold true if there would be students receiving high grades without reading all assignments? It can’t hold true.

Lots of people picked (B) which is a typical reverse causality trap. Its like saying “People who don’t have a driving license can’t be good drivers” - which does not translate into “Everyone who has a driving license has to be a good driver”

(A) No student who completes anything less than all of the reading assignments for a course will earn a high grade for that course.
this we are sure about. because this connects with the premise and the conclusion.
(B) Any student who completes all of the reading and written assignments for a course will earn a high grade in that course.
Any student who completes all may or may not get high grads because we dont know if reading assignements or writen home work is the only criteria for high grades.
(C) All highly motivated students who complete all of the reading assignments for a course will receive high grades for that course.
All highly motivated students will get high grades? not true may or may not get. we dont have premise supporting this that all motivated students doing the work get high grade.
(D) If highly motivated students are required to hand in written homework on their reading assignments, then they will complete all of their reading assignments.what if they copy one anothers homework? this will not be true then.
(E) Some highly motivated students will earn high grades in a course if they are required to hand in written homework on their reading assignments.
we dont know, will ther be no final test? or is ther no other criteria for grading?

Any student who is not required to hand in written homework based on the reading assignments in a course will not complete all of the reading assignments. Even highly motivated students will neglect their reading assignments if they are not required to hand in written homework. Therefore, if the students in a course are given several reading assignments and no written assignments, no student in that course will receive a high grade for the course.

The conclusion of the argument follows logically if which one of the following is assumed?

(A) No student who completes anything less than all of the reading assignments for a course will earn a high grade for that course. -- CORRECT, links the conclusion that high grade = all reading assignments (because in absence of writing assignment, students don't complete reading assignments)
(B) Any student who completes all of the reading and written assignments for a course will earn a high grade in that course. -- The effect of writing assignment on grades is not mentioned in the passage
(C) All highly motivated students who complete all of the reading assignments for a course will receive high grades for that course. -- The passage is about all students; highly motivated students are just part of whole used as example
(D) If highly motivated students are required to hand in written homework on their reading assignments, then they will complete all of their reading assignments. -- This is not the main point of the passage
(E) Some highly motivated students will earn high grades in a course if they are required to hand in written homework on their reading assignments. -- The lack of completion of reading assignment is at issue in the passage, not that of writing assignment

So, the answer is A

The argument centers around finding the supporter assumption as clearly there is a jump from failing to complete reading assignments to obtaining a high grade. First two sentences are premise whereas the last sentence is the conclusion. Observe that the second sentence does not convey any new information.

First statement already says that 'For all students, If no written homework, then reading assignments will be incomplete'
Second statement says that 'For highly motivated students, If no written homework, then reading assignments will be incomplete'

Finally, conclusion says 'If no written homework, then no high grade'

From the first two statements we know that If no written homework then reading assignments will be incomplete. Hence for the author to logically draw the conclusion he or she needs to assume that If reading assignments are not completed, then no high grade or in other words For a high grade, completing reading assignments is NECESSARY.

Choice (A) is another way of saying that completing reading assignments is NECESSARY
Choice (B) says that completing reading assignments is SUFFICIENT to earn a high grade. We cannot say this as there could be many criteria that need to have been met in order to earn a high grade. For example, attendance must be 70 percent etc
Choice (C) again makes reading a SUFFICIENT condition
Choice (D) does not follow from the argument. Also, since it does not talk about high grades, it does not link the premises to the conclusion.
Choice (E) again makes reading a SUFFICIENT condition.

can someone tell me the negation of option A.
Will it be: Some student who completes anything less than all of the reading assignments for a course will earn a high grade for that course.

It will be:

"At least one student who completes anything less than all of the reading assignments for a course will earn a high grade for that course."

This breaks our conclusion.

Any student who is not required to hand in written homework based on the reading assignments in a course will not complete all of the reading assignments. Even highly motivated students will neglect their reading assignments if they are not required to hand in written homework. Therefore, if the students in a course are given several reading assignments and no written assignments, no student in that course will receive a high grade for the course.

The conclusion of the argument follows logically if which one of the following is assumed?

(A) No student who completes anything less than all of the reading assignments for a course will earn a high grade for that course. - CORRECT. It gives the absoluteness that the conclusion makes.
(B) Any student who completes all of the reading and written assignments for a course will earn a high grade in that course. - WRONG. Not 'any student'. A--->B doesn't mean A'---->B' where in A stands for "students in a course are given several reading assignments and no written assignments" and B stands for "no student will receive a high grade for the course, and A' stands for "any student who completes all of the reading and written assignments for a course" and B' stands for "earns a high grade".
(C) All highly motivated students who complete all of the reading assignments for a course will receive high grades for that course. - WRONG. What about writing ones? Half truth.
(D) If highly motivated students are required to hand in written homework on their reading assignments, then they will complete all of their reading assignments. - WRONG. Not necessarily - not 'all'.
(E) Some highly motivated students will earn high grades in a course if they are required to hand in written homework on their reading assignments. - WRONG. Just like D this option is wrong. Actually it is a subset of D.

There are trap answers that use similar words as used in passage.
Here B is surely a trap answer for which i fell.

Answer A.

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