Which sentence from the article shows Murphy's main problem?
A
Murphy was training to enter one of the few
arenas open to young black men.
B
He also began struggling with his weight and
went to dangerous lengths to lose weight
С
Murphy easily beat Garrison, but his win was
downplayed by some viewers and journalists
D
Murphy had helped build the sport of horse
racing, but he was being left out of it.

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.

many citizens are in danger of contracting a food-borne illness.

more people are living with chronic illnesses.

pathogens are becoming stronger and harder to defeat.

edge nuity