Imagine you are approached by a large dog. you assume the dog is unfriendly and start screaming to chase it away. the dog assumes you want to hurt it, so it defends itself by biting your ankle. this is an example of a

I believe the answer is: self-fulfilling belief.

self-fulfilling belief refers to the prediction that cause as to alter our behaviour in a way that eventually cause itself to be true. This tend to becaused by a delusion that make a person think a certain event going to happen to them. Due to this delusion they would not do any actions that might prevent the event, which eventually caused itself to be realized.

i think it's b or c hope this

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.