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:
Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three

Ex Output:
c


Ex Input:
Most marine sediments are of ____ basic types.\Question: Choose the right answer from options given a) three b) ten c) two d) nine

Ex Output:
c


Ex Input:
Dinoflagellates are unicellular forms with ____ to three flagellae .\Question: Choose the right answer from options given a) three b) seven c) one d) six

Ex Output:

c