The correct answer is: A. I will.
The other options are:
- B. I shall: This is a formal way of saying “I will.” It is not typically used in everyday conversation.
- C. I would: This is used to talk about something that is possible or probable. It is not typically used to talk about something that is certain.
- D. Would I: This is a question form of “I would.” It is used to ask for permission or to make a suggestion.
In the given sentence, the mother is asking her child when they will have a glass of milk. The child is likely to say “I will have a glass of milk now,” or “I will have a glass of milk later.” The child is not likely to say “I shall have a glass of milk now,” or “I would have a glass of milk now.” The child is also not likely to say “Would I have a glass of milk now?” because this would sound like they are asking for permission to have a glass of milk.