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]: Ruminants have an even number of toes on each foot and a stomach with either three or ____ chambers.\Question: Choose the right answer from options given a) four b) two c) seven d) five
[EX A]: a

[EX Q]: All cattle have a ____ chambered stomach, consisting of a rumen, reticulum, omasum and abomasum.\Question: Choose the right answer from options given a) ten b) four c) six d) two
[EX A]: b

[EX Q]: Alpacas have ____ sets of teeth for processing food.\Question: Choose the right answer from options given a) seven b) five c) no d) two
[EX A]:
d