Whether the optimal level of product availability is high or low depends on where a particular company believes they can

Which of the following is NOT one of the basic factors influencing worker's job performance?

A. Role perceptions B. Government C. Aptitude D. Skill level E. Motivation

Commas separate items within __________________________

a. a series of three or more b. an introductory clause c. a cohesive paragraph d. a sentence fragment