What did students take away from the discussion between the author and mr. brock according to the author of on writing well?

Which of these sentences would best express the main idea of a speech arguing that people should participate in a charity softball tournament? a) softball is a great way to get some much-needed exercise. eliminate b) the money raised by the tournament will local animal shelters. c) the tournament is a fun way to spend time with friends while a worthy cause. d) even if you don't have any softball experience, you can form a team and participate.