Frame ‘wh’ question for the given sentence:
Mother is cooking food in the kitchen.
a. Where is the mother cooking the food?
b. Mother is cooking the food, isn’t she?
c. Mother is doing what?
d. Mother is in the kitchen, isn’t she?

Hint: The statement presents the place and action performed by the mother.

Complete answer:
Uses of different ‘wh’ questions
When
When is used to specify time.
When did he leave?

Why
Why is used to ask for a reason.
Why are you late?

What
What is used to ask about something.
What did you say?

Where
Where is used to ask about a specific place.
Where do you live?

Which
Which is used to ask for a choice or option.
Which one do you want?

Whose
Whose is used to specify ownership.
Whose car is this?

Whom
Whom is used to indicate a particular person. It is always an object.
Whom did you go with?

Who
Who is used to asking about which person. It is a subject to a verb.
Who called me?

Option a is perfectly answered by the statement in the question. It specifies the place the mother is cooking the food. So, option a is correct.
Option b would have been answered by a yes or no. yes, the mother is cooking the food or no, the mother isn’t cooking the food. So, this option is incorrect.
Option c would be answered specifying the action of the mother but the statement in the question gives more information than that. So, this option is also incorrect.
Option d is like a confirmation question confirming about the venue where the mother is and no inclination is given to what she is doing. So, option d is also incorrect.

Note: The statement must satisfy the question asked.