I'm pretty sure the answer is A.) gerund.
Explanation:
What qualities you will be using to enhance your performance.
Which bad qualities should be kept in check to proper working.
Bumpy, rocky, rugged, jagged, ridged, sharp, and coarse.
He is known for alleging that numerous communists and Soviet spies and sympathizers had infiltrated the United States federal government, universities, film industry, and elsewhere. Ultimately, the smear tactics that he used led him to be censured by the U.S. Senate.