Question

Which sentence uses the word diligence correctly?
a. Through hard work and diligence, the student passed the course.
b. Her diligence made it difficult to pass the course.
c. The carpenter s diligence made it difficult to create cabinetry with fine detail.
d. All of the above.

Answer 1

I am pretty sure it is option "A."
Diligence by definition means to "careful and persistent work or effort"
So yeah the answer is A.
Hope this helped-- 

Answer 2

A. Through hard work and diligence, the student passed the course.