國中英語基測出現過 them 的考題。

While reading this story, Brad saw the word “trolling” and didn't know what it meant.

Josh turned off the screen and sat back.Why are they trolling me like this?” He didn't understand. They wanted him to share what he thought about the show, and he did. And now look what he got. In the end, all they wanted was nice words.

He found several meanings of the word in a dictionary. Which one should Brad choose?
To pull a fishing line through the water, often from a boat.
To celebrate in song.
To make someone or something move around.
To write something on the Internet to hurt someone or make them angry.