Getting a Salesperson to Prospect for New Business, Call on Those

Getting a salesperson to prospect for new business, call on those potential customers that fit your marketing strategy, and provide the drive to maintain a regular prospecting schedule describes which characteristic of effort?

A) The drive to initiate action on a task.
B) The quality of effort on a task.
C) The persistence to expend effort over a period of time.
D) All of the above are characteristics of effort
E) None of the above is a characteristic of effort because a person's effort level ultimately cannot be affected by outside factors.