Final answer:
The correct answer is option b. The speaker criticizes Russ's behavior by negatively referring to him as a 'do-gooder weirdo', indicating disapproval rather than praise or a compliment.
Step-by-step explanation:
The phrase 'a do-gooder' often refers to a person who is overly idealistic, putting excessive effort into charitable works or social justice, sometimes with a negative connotation of doing so for self-gratification or naivety.
In the statement provided, 'J: Russ is a sexually inexperienced do-gooder weirdo.', the speaker, J, seems to be making a negative commentary on Russ's behavior rather than complimenting him. Therefore, the correct answer is: b) J criticizes Russ's behavior.