Although the results are mixed, has often been used by teachers who are eager to instill order in an unruly classroom.

The correct answer is A) a token economy.

Although the results are mixed, a token economy has often been used by teachers who are eager to instill order in an unruly classroom.

One of the techniques people use in contingency management is a token economy to reinforce an expected behavior. The token is the symbol that is going to be used to exchange it for the expected behavior.  In school, for instance, teachers use stickers with the figures of stars, the sun or animals to give their students when they do something correctly.

The other options of the question were B) programed learning. C) biofeedback training. D) physical punishment.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.

the awnser is that is tru your

lol bye