Correct Answer & Explanation
Option A
• For an interrogative sentence, 'said to' changes to 'asked'.
• As it's a 'Yes/No' question, 'if' or 'whether' is used as a connector.
• The tense 'Present Perfect' ('Have you completed') changes to 'Past Perfect' ('they had completed').
• The pronoun 'you' changes to 'they' (referring to the students) and 'your' changes to 'their'.