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:
Ants have six legs, and each leg has ____ joints.\Question: Choose the right answer from options given a) nine b) zero c) two d) three

Ex Output:
d


Ex Input:
Women gain ____ years per child they had.\Question: Choose the right answer from options given a) ten b) nine c) four d) two

Ex Output:
d


Ex Input:
Dogs are pack animals, and ____ dogs is the minimum number for proper socialization.\Question: Choose the right answer from options given a) four b) five c) no d) zero

Ex Output:

b