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]: Many scientists believe the neutrino has ____ mass at all.\Question: Choose the right answer from options given a) eight b) zero c) two d) no
[EX A]: d

[EX Q]: Adult tarantulas require a minimum of ____ to five crickets a week.\Question: Choose the right answer from options given a) seven b) three c) four d) five
[EX A]: b

[EX Q]: Hawks have three toes pointing forward and ____ pointing backwards.\Question: Choose the right answer from options given a) one b) nine c) seven d) zero
[EX A]:
a