The question is a yes/no question about the mother's presence in the garden. The provided options include 'No, it isn't', 'Yes, there were.', 'Yes, there is.', and 'No, there wasn't.'. To answer this question, we need a preceding statement or context that establishes whether the mother is in the garden. If we assume a scenario where the mother is indeed in the garden, then the most appropriate affirmative answer among the choices would be 'Yes, there is.' considering the singular subject 'mother'.
Answer: g) Yes, there is.