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]: Brain death occurs in just four to ____ minutes unless the heart rhythm is restored.\Question: Choose the right answer from options given a) ten b) three c) six d) nine
[EX A]: c

[EX Q]: Baby elephants are usually dependent on mother s milk for at least ____ years.\Question: Choose the right answer from options given a) six b) three c) two d) seven
[EX A]: b

[EX Q]: Most mothers give birth to one young an average of every five to ____ years in the wild.\Question: Choose the right answer from options given a) five b) six c) zero d) no
[EX A]:
b