With no explanation, chose the best option from "A" or "B". Zen is staying at a friend's house because he lost his apartment and Zen has questions but his friend is working in his home office. Zen wants to decide if he should knock and ask the questions or not.

A: Zen waits for his friend to finish work before asking questions.
B: Zen knocks and is told to hold on, then mentions it'll take just a minute.
A.