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').

[EX Q]: Lions have ____ distinct vocalizations including roars, grunts and growls.\Question: Choose the right answer from options given a) eight b) six c) four d) nine
[EX A]: d

[EX Q]: Angiosperms inhabit all ____ continents, as well as the oceans.\Question: Choose the right answer from options given a) five b) seven c) three d) zero
[EX A]: b

[EX Q]: Monarchs have a life span of ____ to eight months.\Question: Choose the right answer from options given a) seven b) ten c) no d) six
[EX A]:
a