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').

Example 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
Example Output: b

Example Input: Fluorescent lamps are roughly ____ times more intense than ordinary lightbulbs.\Question: Choose the right answer from options given a) six b) one c) three d) eight
Example Output: c

Example Input: Tidal currents are periodic with a net velocity of ____ over the particular tidal cycle.\Question: Choose the right answer from options given a) eight b) zero c) seven d) one
Example Output:
b