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Under normal circumstances, online classes are ideal for a specific type of student, such as people over thirty years of age and employed persons.
(A) people over thirty years of age and employed persons.
(B) people over thirty and the employed.
(C) the employed or those over the age of thirty.
(D) the employed or students who are over the age of thirty.
(E) those who have reached thirty years of age and are employed.
OFFICIAL EXPLANATION:
(Word Order) A quick scanning of the answer choices shows that all of them use almost the same words but written different sequence, indicating that the error, if any, in the given sentence is the use of a wrong word order. When we examine the sentence closely, we can see that there is indeed such an error. The given sentence would imply that two types of students make ideal candidates for online classes; students “over the age of thirty” and students over “employed persons.” While the former phrase makes sense, the latter phrase does not.
Obviously the author wishes to list the two important capabilities of old people as “over the age of thirty” and “employed persons.” So, in order to remove the ambiguity, the phrase “employed persons” (or employed students, the employed, etc.) must be stated first, so that it does not come after the preposition “over.”
So, (A) is wrong
(B) has the same error, and can be eliminated for that reason alone.
(E) implies that there is a single ideal group consisting of people who are both over thirty and employed, instead of two groups meeting one of two criteria. So, (E) is also wrong.
(C) and (D) correct the basic error in the given sentence. The difference between them is in the phrases “the employed or those over..” and “the employed or students who are over.” The former is shorter and more idiomatic, and is the better choice.
So, (C) is the answer.