Leadership is a clear vision and a meaningful sense of purpose that ______ the momentum.
a.) generate
b.) generates

Note: i made this question up myself.
what would you choose if you had to pick one answer of the two?
or
what would you rewrite this sentence to make it better sounding?

Question

Leadership is a clear vision and a meaningful sense of purpose that ______ the momentum. 
a.) generate 
b.) generates

Note: i made this question up myself. 
what would you choose if you had to pick one answer of the two?
or
what would you rewrite this sentence to make it better sounding?

Answer

since the subject is "Leadership", the right verb should be "generates" (b).

I think you can also omit the article "the" after the verb 'generates':

"Leadership is a clear vision and a meaningful sense of purpose that generates  momentum."

:)