Correct Answer: D
The phrase “一把手 (yī bǎ shǒu)” literally means “a hand.” Now, it is used to mean someone primarily responsible for a particular aspect of work, usually the leader of an organization or a company. It can be translated as “the first in command/top executive/chief executive etc,” depending on the job description of that particular individual and the type of company they work for. In Chinese, though, you can just say “一把手 (yī bǎ shǒu).”
Tā shì wǒmen chǎng de yī bǎ shǒu.
他 是 我们 厂 的 一 把 手。
He is the top executive of our factory.
Tā shūshu shì wǒmen xuéxiào de yī bǎ shǒu.
他 叔叔 是 我们 学校 的 一 把 手。
His uncle is the top executive of our school.