Answer:
C) A variable ratio reinforcement schedule
Step-by-step explanation:
In operant conditioning, a variable ratio reinforcement schedule is very similar to a fixed ratio schedule except that the reinforcements are awarded on a variable basis.
In this case, the basis is variable because the company uses the average number of projects, that means that one month Neil can complete 10, or 20, or 18, etc., but as long as his average is 15 or more, then he will get the bonus.
In order for this monthly bonus to be considered a fixed ratio schedule, the number of projects presented by Neil should be at least 15 per month, and no lower number would be accepted.
The interval is fixed since the bonus is always given on a monthly basis.