Errors in the use of punctuation marks - Use of Quotation Marks and Terminal Punctuation

the answer is d.

A.Several universities in the city offer the following degrees: B.A., M.A., Ph.D.

B.Must students write a research paper and pass a written examination in order to receive an M.A.?

C.Fasten your seat belt.

D.The unspoken questions were when would he return and how long would she be willing to wait for him?

Correct.

To identify the error in the use of punctuation marks, specifically quotation marks and terminal punctuation, we need to examine each sentence:

A. Several universities in the city offer the following degrees: B.A., M.A., Ph.D.
The use of quotation marks and terminal punctuation in this sentence is correct. There are no errors.

B. Must students write a research paper and pass a written examination in order to receive an M.A.?
This sentence does not use any quotation marks, so there is no error in the use of quotation marks. However, there is an error in the use of terminal punctuation. The sentence should end with a question mark, not a period. The correct sentence should be:
Must students write a research paper and pass a written examination in order to receive an M.A.?

C. Fasten your seat belt.
This sentence does not use any quotation marks and has correct terminal punctuation. There are no errors.

D. The unspoken questions were when would he return and how long would she be willing to wait for him?
This sentence does not use any quotation marks, so there is no error in the use of quotation marks. However, there is an error in the use of terminal punctuation. The sentence should end with a question mark to indicate that the statements are questions. The correct sentence should be:
The unspoken questions were when would he return and how long would she be willing to wait for him?

Therefore, the correct answer is B: Must students write a research paper and pass a written examination in order to receive an M.A.?