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:
Cleavage is perfect in ____ directions, prismatic.\Question: Choose the right answer from options given a) two b) nine c) three d) seven

Ex Output:
a


Ex Input:
Electrolytic capacitors have a useful life of about ____ years.\Question: Choose the right answer from options given a) ten b) eight c) zero d) seven

Ex Output:
a


Ex Input:
Snakes have no legs and ____ ears.\Question: Choose the right answer from options given a) one b) nine c) no d) four

Ex Output:

c