单项选择题

His pleasant personality is derived from his good humor and understanding.

A.由于他性情好又富于同情心,所以他招人喜爱。
B.他性格好,这是因为他心情好并且通情达理的缘故。
C.他良好的个性源自于他良好的性情和理解力。
D.他心情愉快,通情达理,所以性格开朗。