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:
All baleen whales have ____ blow holes.\Question: Choose the right answer from options given a) zero b) four c) seven d) two

Ex Output:
d


Ex Input:
Sea stars have ____ arms, or rays, connected to a small round body.\Question: Choose the right answer from options given a) five b) six c) seven d) no

Ex Output:
a


Ex Input:
Pears are oriented stem-down into ____ feed cups.\Question: Choose the right answer from options given a) ten b) four c) six d) three

Ex Output:

c