Had Decided is underlined PLZZ HELP URGENT :)

ill brainiest the correct answer

What is the principal part of the underlined verb in the sentence? 

Hank had decided to use the bigger hammer.



 
A.
present


 
B.
past participle


 
C.
past


 
D.
present participle



2.
What is the principal part of the underlined verb in the sentence? 

I knew our plan would work.



 
A.
present


 
B.
past participle


 
C.
present participle


 
D.
past


Knew is underlined