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]: Honeybees have ____ jobs.\Question: Choose the right answer from options given a) ten b) one c) three d) two
[EX A]: d

[EX Q]: Diatoms look like ____ shells that fit together.\Question: Choose the right answer from options given a) zero b) one c) two d) seven
[EX A]: c

[EX Q]: Mustelids have ____ toes on their feet and their claws can be retracted by some species.\Question: Choose the right answer from options given a) one b) five c) four d) three
[EX A]:
b