Despite the trust bestowed on the minister he turned out to be a snake in the grass during the revolution. A. a secret enemy B. a treacherous person C. an unforeseen danger D. an unexpected misfortune

The correct answer is: B. a treacherous person.

A snake in the grass is a person who is treacherous or deceitful, especially one who pretends to be friendly but is actually working against someone. In the context of the question, the minister was trusted by the people, but he turned out to be a traitor who was working against them. This makes him a snake in the grass.

The other options are not correct because:

• A secret enemy is someone who is against someone else but does not show it. This does not describe the minister, who was pretending to be friendly to the people.
• An unforeseen danger is a danger that is not expected. This does not describe the minister, who was deliberately working against the people.
• An unexpected misfortune is a misfortune that happens by chance. This does not describe the minister, who was deliberately working against the people.