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]: Giraffes sleep less than ____ hours a day.\Question: Choose the right answer from options given a) two b) six c) seven d) ten
[EX A]: a

[EX Q]: Some snails can pull over ____ times their own body-weight.\Question: Choose the right answer from options given a) nine b) six c) five d) three
[EX A]: d

[EX Q]: Giraffes have two horns and two or ____ knobs.\Question: Choose the right answer from options given a) two b) three c) five d) four
[EX A]:
b