According to your study unit, which one of the following improved human relations skills will allow you to more willingly take on challenging subjects?
a. flexibility
b. communication
c. self-confidence
d. listening

According to the study unit, the skill that will help you in improving human relations skills and will allow you to more willingly take on challenging subjects is Flexibility. Flexibility is defined as easily changing or adapting onto things or events or people. Now this needed when we establish some human interactions because we meet new and different personality people everyday. Taking on challenging subjects, it’s very important to be always ready and easily bend onto different subjects, this helps you understand more and broaden your perspective.

The error in the sentence is a dangling modifier

Iam pretty sure the answer is c