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').

[Q]: Ants have ____ stomachs.\Question: Choose the right answer from options given a) two b) nine c) four d) seven
[A]: a


[Q]: All spider mites have ____ legs and a lack of a separate head.\Question: Choose the right answer from options given a) eight b) four c) ten d) one
[A]: a


[Q]: Primates are divided into ____ subgroups.\Question: Choose the right answer from options given a) seven b) one c) four d) two
[A]:
d