PLZ help me I will give you a medal for the best response. What is the principal part of the underlined verb in the sentence?

I am letting him use my skateboard for the week.

A.
past

B.
present participle

C.
present

D.
past participle

Question

PLZ help me I will give you a medal for the best response. What is the principal part of the underlined verb in the sentence? 

I am letting him use my skateboard for the week.
 
 A.
past
 
 B.
present participle
 
 C.
present
 
 D.
past participle

rainbow_rocks03 · Answer

Am letting is the underlined word.

anonymous · Answer

I believe it is A in my opinion.

rainbow_rocks03 · Answer

I was thinking that to but I wasn't sure. Thx @trinitybagwell

anonymous · Answer

anytime :)