Does that argument make an unwarranted assumption—have a false premise—or does its conclusion not follow strictly from the premises—is it invalid?

Attitudinal Hedonism

Choose a specific version of Hedonism we’ve discussed (for instance, one of the four from part A), and offer an argument in favor of it specifically.
Present the best objection you can to the argument from B.1. (Does that argument make an unwarranted assumption—have a false premise—or does its conclusion not follow strictly from the premises—is it invalid?)
Defend the argument in B.1 as best you can (you can either argue that the objection in B.2 is misplaced or you can modify the original argument in B.1 so that it isn’t vulnerable to the objection). Is your defense enough to save the argument?