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:
Double price is based on two golfers sharing ____ room.\Question: Choose the right answer from options given a) one b) zero c) six d) nine

Ex Output:
a


Ex Input:
Gases are perhaps the best understood of the ____ states of matter.\Question: Choose the right answer from options given a) three b) five c) nine d) zero

Ex Output:
a


Ex Input:
Giraffes have two horns and ____ or three knobs.\Question: Choose the right answer from options given a) nine b) five c) two d) eight

Ex Output:

c