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').

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

Water softeners add sodium to drinking water in ____ ways.\Question: Choose the right answer from options given a) zero b) six c) two d) nine
c

Mantids tend to be green or tan, and vary from ____ to six inches long.\Question: Choose the right answer from options given a) one b) nine c) seven d) three

d