Which of the following sentences is punctuated correctly?

Question

Quizplus · Accepted Answer

She refused to answer when I asked who her previous employer was. This sentence is grammatically correct. It is a statement, so it requires a period as its end punctuation.
She refused to answer when I asked who her previous employer was? This sentence is not grammatically correct because it uses the wrong end punctuation. The sentence is a statement and not a question, so it should end with a period.
She refused to answer when I asked who her previous employer was: This sentence is not grammatically correct because it uses the wrong end punctuation. The sentence is a statement should end with a period. A colon cannot be used as the ending punctuation for a sentence.
She refused to answer when I asked who? her previous employer was. This sentence is not grammatically correct because it incorrectly places a question mark in the middle of the sentence. If the question mark were to be removed, the sentence would be grammatically correct.

Which of the Following Sentences Is Punctuated Correctly