A student is revising the sentence below: I know Brendan was upset, but I feel he overreacted. You would have thought he'd just lost his best friend, the way he would bemoan his fate. Based on the context of this sentence, which is the best synonym for bemoan?

A. Complain: express dissatisfaction or annoyance
B. Grieve: cause distress to someone
C. Nag: annoy with persistent fault-finding
D. Provoke: stimulate or incite