Mr. hanson tells his class that if they work hard during math time and finish all of their problems, they do not have to have math homework for that day. to increase their on-task behavior during math, mr. hanson is usinga) extinction. b) a secondary reinforcement. c) an antecedent. d) a negative reinforcement. e) shaping.

C)an antecedent

Explanation: Antecedent is preceding situation or event in which the human being tends to perform the learned behavior or nature. This type of behavior is used for the elimination of the pushing results/consequences by manipulation of the situation.

Other options are incorrect because extinction is the reduction of the something, secondary reinforcement refers to stimulus reinforce and shaping is structuring something according to the requirement .Thus the correct option is option(c).

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.

answer; opportunities to further the healthy development to deal with the crisis of the next stage;