Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Onion thrips experience ____ instars.\Question: Choose the right answer from options given a) three b) six c) eight d) four
d

Most ovarian cysts go away on their own in ____ to three months without causing any problems.\Question: Choose the right answer from options given a) one b) ten c) five d) eight
a

Casein proteins have ____ major types, and all three appear in every mammal species on Earth.\Question: Choose the right answer from options given a) one b) no c) three d) four

c