To be a great manager requires strong interpersonal skills, the ability to think fast and demands a can-do attitude.

a. requires strong interpersonal skills, the ability to think fast and demands
b. requires strong interpersonal skills, the ability to think fast and
c. requires strong interpersonal skills, demands the ability to think fast and
d. requiring strong interpersonal skills, the ability to think fast and demands
e. require strong interpersonal skills, the ability to think fast and

OA: B

What's wrong with options C and D?