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Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually over two hundred pages.


(A) Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually
Whereas should be followed after a object that's to be compared therefore the right meaning is not conveyed therefore out

(B) A typical Master's thesis is approximately one hundred pages long, while a Ph.D thesis is generally
The comparison and meaning is perfect therefore our answer

(C) A typical Master's thesis is approximately one hundred pages long, so a Ph.D thesis is usually
so a is giving a meaning as though the Master's thesis is predetermining the volume of the Phd thesis therefore out

(D) While typical Master's theses is approximately one hundred pages long, Ph.D theses is generally
Thesis sshould be the right usage Therefore out

(E) Whereas a typical Master's thesis is approximately one hundred pages long, a Ph.D thesis is
Similr reasoning as A and the intended meaning is also not right

Therefore IMO B
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Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually over two hundred pages.

(A) Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually -> A typical master's thesis should be compared with "a Ph.D theses", not with every "Ph.D theses". Also, SVA error encountered. Incorrect.

(B) A typical Master's thesis is approximately one hundred pages long, while a Ph.D thesis is generally -> This is better. Let's keep it.

(C) A typical Master's thesis is approximately one hundred pages long, so a Ph.D thesis is usually -> "So" is incorrect to use as we have a contrast. Incorrect.

(D) While typical Master's theses is approximately one hundred pages long, Ph.D theses is generally -> We are saying for all cases, then we need plural verb. Incorrect.

(E) Whereas a typical Master's thesis is approximately one hundred pages long, a Ph.D thesis is -> Meaning issue. Incorrect.

So, I think B. :)
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Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually over two hundred pages.

Meaning of the sentence: Length of Master's thesis is approximately one hundred pages.( so it could be 90 pages or it could be 110 pages, depending on the perspective of the author, who is making this statement, it could be how close is the approximation to 100). The usage of typical, conveys that there could be exception to it that it could be 10 or 1000 pages as well. On the other hand, Length of Ph.D thesis is usually over 200 pages conveys, that it could be even 10 pages( less than expected) in extreme situations.

So the sentence requires to contrast between the two type of thesis. Since there is no time involved( like Sam visited my office, while I was away) both while and whereas can be used, to show the contrast, interchangeably.


(A) Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually
theses is plural and does not agree with the verb, is. Eliminate.

(B) A typical Master's thesis is approximately one hundred pages long, while a Ph.D thesis is generally
This looks perfect with no errors like in other choices. So answer is choice B.


(C) A typical Master's thesis is approximately one hundred pages long, so a Ph.D thesis is usually
so is not contrasting, instead it is concluding (like how we use therefore, as a result, hence etc) and changes the meaning of the sentence. Eliminate


(D) While typical Master's theses is approximately one hundred pages long, Ph.D theses is generally
theses is plural and does not agree with the verb, is. Eliminate.


(E) Whereas a typical Master's thesis is approximately one hundred pages long, a Ph.D thesis is
This is grammatically correct, but conveys a different meaning as the "usually/generally keyword is missing". It says, that the Ph.D thesis is always over 200 pages and misses the exceptional cases when it could be less than 200. Eliminate.
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Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually over two hundred pages.


(A) Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually
Theses = plural Noun of thesis => Wrong SVA

(B) A typical Master's thesis is approximately one hundred pages long, while a Ph.D thesis is generally
No errors dectected. => HOLD

(C) A typical Master's thesis is approximately one hundred pages long, so a Ph.D thesis is usually
=> the "so" expresses the relationship between Master's thesis and Ph.D thesis => this is wrong.

(D) While typical Master's theses is approximately one hundred pages long, Ph.D theses is generally
Theses = plural Noun of thesis => Wrong SVA

(E) Whereas a typical Master's thesis is approximately one hundred pages long, a Ph.D thesis is
=> This sentence eliminate the implied meaning of emphasizing the difference between Master's thesis and Ph.D thesis => Wrong

IMO: B
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A, and D - Eliminated because of SV agreement - theses is
A, and E - Eliminated because use of Whereas - is a conjuction used in contrast or comparison with the fact, most of the cases prefered to be used between the two joining sentence, and rarely starting of the sentence followed to Noun.

Approximately,
Generally, and
Usually - all 3 are Adverb, maintain parallelism, which is absent in & will eliminate option - C, and E

With use of While as a conjunction between two clause, maintained adverb parallelism, and intended meaning - B is Good option.

(A) Whereas a typical Master's thesis is approximately one hundred pages long, Ph.D theses is usually - eliminated

(B) A typical Master's thesis is approximately one hundred pages long, while a Ph.D thesis is generally

(C) A typical Master's thesis is approximately one hundred pages long, so a Ph.D thesis is usually - eliminated

(D) While typical Master's theses is approximately one hundred pages long, Ph.D theses is generally - eliminated

(E) Whereas a typical Master's thesis is approximately one hundred pages long, a Ph.D thesis is - eliminated
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