The helping verb in that sentence is: B) had
The word had, "helps" the verb risen by telling when the moon risen up
The word had tells that the moon has already risen up
The word A) evening is a noun, not a verb
The word C) early is an adjective, not a verb either
The word D) is a verb but it isn't a helping verb because it doesn't "help" any verb
Therefore B) had is the correct answer
