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').

Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven
c

Cyclic neutropenia tends to occur every three weeks and last ____ to six days at a time.\Question: Choose the right answer from options given a) six b) four c) five d) three
d

Orchids have ____ main ways of growing.\Question: Choose the right answer from options given a) ten b) five c) four d) two

d