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').

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

Output: b


Input: Consider Input: Brain death occurs in just four to ____ minutes unless the heart rhythm is restored.\Question: Choose the right answer from options given a) ten b) three c) six d) nine

Output: c


Input: Consider Input: USGS maps use symbology to distinguish ____ classes of roads plus trails.\Question: Choose the right answer from options given a) six b) five c) zero d) no


Output: b