Given the task definition and input, reply with output. In this task, you will be shown a conversation and a question. You need to answer the question and choose the correct option based on the conversation. "W" and "M" in the conversations stand for "woman" and "man".

M: Mary, would you like to have a picnic with us tomorrow? W: Sorry, but mum asked me to go shopping with her., Question: What will the girl do tomorrow? (A) Have a picnic. (B) Stay at home with her mum. (C) Go shopping.
(C) Go shopping.