Bias in matching can be used to predict a. how melioration will affect an individual's choices b. the optimum level of responding for maximum rewards c. degree of preference for different reinforcers d. an individual's level of self-control

c. degree of preference for different reinforcers  

Explanation:

The answer is --

c. degree of preference for different reinforcers

The term "Bias in matching" means  it is more likely to see cases as applicable and logical in logical reasoning work when the lexical content of the case equals to the propositional rule.

If different alternatives leads to a different reinfocers, then the reinfocer which is bias to one represents reiforcer preference.

Thus the answer is

c. degree of preference for different reinforcers  

answer; (you have the right of way);