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]: 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]: Natural indium contains ____ isotopes.\Question: Choose the right answer from options given a) one b) eight c) two d) seven
[EX A]: c

[EX Q]: Weak equivalence is important in cognitive science in ____ respects.\Question: Choose the right answer from options given a) eight b) zero c) four d) two
[EX A]:
d