Meaning of ‘Jump on the bandwagon’:

The idiom 'Jump on the bandwagon' means to join a popular trend, activity, or cause, often because it has become fashionable or successful, rather than out of genuine conviction or belief. It implies following the crowd or aligning oneself with something that is currently popular to gain advantage or acceptance.

• Option A ('Be extremely excited about something') describes enthusiasm, but not specifically the act of joining a popular trend.
• Option B ('Be influenced easily') describes a characteristic that might lead someone to jump on a bandwagon, but it's not the direct meaning of the idiom itself.
• Option D ('Call for trouble') means to invite problems or difficulties, which is unrelated to the meaning of the idiom.