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').

Ex Input:
Prairie voles look like rodents with small rounded bodies, ____ short legs and a short tail.\Question: Choose the right answer from options given a) two b) nine c) four d) zero

Ex Output:
c

Ex Input:
Serial transfer is the sequential transmission of the ____ bit-voltages that constitute a byte.\Question: Choose the right answer from options given a) ten b) eight c) two d) four

Ex Output:
b

Ex Input:
Plants are divided into ____ broad categories based on their mode of reproduction.\Question: Choose the right answer from options given a) three b) six c) four d) eight

Ex Output:
c