what was the belief held during the cold war regarding neighboring countries of communist countries all falling victim to communism known as?
a. collective security
b. 38th parallel
c. domino theory
d. containment

No clue what is the answer

If i remember correctly it was caused by people hurling bodies at a country for some reason and them they all became infected

True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc.