TASK DEFINITION: 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').
PROBLEM: 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

SOLUTION: b

PROBLEM: Some skulls show the marks of up to ____ bullets.\Question: Choose the right answer from options given a) five b) three c) eight d) six

SOLUTION: d

PROBLEM: Young animals become fully mature in about six to ____ years.\Question: Choose the right answer from options given a) no b) seven c) five d) two

SOLUTION:
b