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:
Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no

Ex Output:
a


Ex Input:
Pistillate flowers have a compound ovary with ____ locules topped by three sticky, sessile stigmas.\Question: Choose the right answer from options given a) zero b) three c) six d) seven

Ex Output:
b


Ex Input:
Mangroves are the common name for ____ species of trees and shrubs found along warm water coasts.\Question: Choose the right answer from options given a) three b) five c) four d) seven

Ex Output:

a