Which is most likely the reason that the author uses second person pronouns in the book review?

Okay yall solve this riddle what gets wetter as it dries

Choose one group member who participated in your discussion. in 100-150 words, evaluate the effectiveness of their main argument and supporting evidence. using your notes, explain whether or not their claims were developed well, what evidence they used to support their claim, and how well they responded to the prompt. is there anything they could have done to be more effective? if so, what was it?

When the subject of a sentence performs the action in the sentence the verb in the sentence is in the what ?