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').

[Q]: Gravity is the force that brings ____ objects together .\Question: Choose the right answer from options given a) five b) two c) one d) nine
[A]: b


[Q]: Humans normally produce only ____ sets of teeth.\Question: Choose the right answer from options given a) nine b) eight c) two d) three
[A]: c


[Q]: Bialys are low in calories, fat and cholesterol and have ____ preservatives added.\Question: Choose the right answer from options given a) five b) six c) ten d) no
[A]:
d