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:
Millipedes have ____ pairs of legs on each body segment.\Question: Choose the right answer from options given a) seven b) ten c) six d) two

Ex Output:
d


Ex Input:
Aridity presents ____ main obstacles to solitary behavior.\Question: Choose the right answer from options given a) no b) three c) two d) five

Ex Output:
c


Ex Input:
Group communication exists among ____ or more people who have some common purpose.\Question: Choose the right answer from options given a) one b) six c) three d) two

Ex Output:

c