Q: 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: I wonder what makes mother so upset these days. W: Father is canceling his vocation trip. He promised to take her abroad last year. But the company is asking father to postpone his vocation., Question: Why is their mother unhappy? (A) Their father is unable to keep his promise. (B) Their father is going on a vacation without her. (C) Their father isn't telling her the truth.
A:
(A) Their father is unable to keep his promise.