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]: Pups remain in the den for about ____ weeks, and are cared for by the entire pack.\Question: Choose the right answer from options given a) ten b) three c) six d) no
[EX A]: c

[EX Q]: Calves can browse and follow their mother at three weeks old and are weaned at ____ months.\Question: Choose the right answer from options given a) five b) seven c) four d) three
[EX A]: a

[EX Q]: Smoking is responsible for one out of ____ cases of heart disease.\Question: Choose the right answer from options given a) nine b) four c) eight d) seven
[EX A]:
b