✅ In American English, terminal punctuation such as question marks that belong to the quoted material are always placed inside the closing quotation mark, as correctly shown in option B.

❌ Option A is incorrect because the comma, which introduces the explanatory clause "he remarked," should be placed inside the closing quotation mark.

❌ Option C is structurally incorrect; a single continuous quote should not be broken this way, and the second quote is improperly introduced without a comma or connecting phrase.

❌ Option D is incorrect because the period, which is part of the quoted statement, should be placed inside the closing quotation mark.