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').

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
a

Bytes are sets of ____ bits.\Question: Choose the right answer from options given a) four b) eight c) five d) ten
b

Adult muskrats average ____ foot in length and three pounds in weight.\Question: Choose the right answer from options given a) six b) one c) eight d) five

b