After Bill Helped the Elderly Gentleman with His Bags,he Wondered

Multiple Choice

After Bill helped the elderly gentleman with his bags,he wondered if he wasn't simply being selfish,since he felt good afterwards about what he did.Psychological egoism would be true of Bill's actions only if

A) Bill had the desire to help only because they made Bill feel good.
B) Bill felt good after helping.
C) by not acting Bill's conscience would have bothered him later.
D) Bill acted out of his own desire to help.