Staff performs the requirements of their department ________ and ________.

• A. Politely and slowly
• B. Quickly and carelessly
• C. Knowledgeably and proficiently
• D. Silently and invisibly

Answer: (C)

Describing how staff perform tasks uses words that signal both understanding and ability. Knowledgeably means they use relevant knowledge and judgment when doing their work, while proficiently indicates they carry out tasks with skill and competence. Together, these terms convey that department requirements are met through informed, capable performance—precise and well-executed. The other pairings shift focus to manners, pace, or secrecy and don’t communicate the same level of professional competence. So this combination best captures doing the job with both understanding and skill.