Question

Fill in the blank with the most appropriate word.
________ did Helen eat for breakfast?

• A. When
• B. What
• C. Where
• D. Why

Answer 1

The correct option is B What

Here, 'what' as an interrogative pronoun is correct because it is used in questions to ask for particular information about somebody/something. Here, information is being asked about Helen's breakfast.
'Where is incorrect because it is used after words or phrases that refer to a place or situation to mean ‘at, in or to which’.
'When' is incorrect because it is used after an expression of time to mean ‘at which’ or ‘on which’.
'Why' is incorrect because it is used in questions to ask the reason for or purpose of something.