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]: Worker bees have ____ pairs of wax glands on the underside of their abdomens.\Question: Choose the right answer from options given a) no b) two c) nine d) four
[EX A]: d

[EX Q]: Bone marrow replenishes itself fully within ____ weeks.\Question: Choose the right answer from options given a) nine b) no c) one d) two
[EX A]: d

[EX Q]: All hairs have a life expectancy of ____ to six years.\Question: Choose the right answer from options given a) one b) six c) two d) three
[EX A]:
d