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:
Bucks grow antlers each year that reach ____ to six feet in spread.\Question: Choose the right answer from options given a) seven b) one c) three d) five

Ex Output:
d


Ex Input:
Some programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three

Ex Output:
c


Ex Input:
Perennials can take three or ____ years to reach a mature size.\Question: Choose the right answer from options given a) three b) one c) four d) ten

Ex Output:

c