Which of the Following Is the Best Example of Problem

Which of the following is the best example of problem solving?

A) Joan and her friends debate the current political situation in China into the wee hours of the night.
B) Roy is worried about his persistent sore throat. He does research on the Internet and decides to contact his doctor.
C) Joe feels discouraged by his weight gain during his first year in college. He doesn't know quite what to do, so he continues in his current lifestyle.
D) Reed lets her friend vent about her nonexistent dating life. She listens empathically but does not offer advice.