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:
Real airplanes have round engines and ____ wings.\Question: Choose the right answer from options given a) four b) six c) three d) two

Ex Output:
d


Ex Input:
Insects have ____ pairs of legs and three body segments.\Question: Choose the right answer from options given a) one b) nine c) no d) three

Ex Output:
d


Ex Input:
Libertarians believe that the government has ____ business dictating morality.\Question: Choose the right answer from options given a) nine b) no c) three d) two

Ex Output:

b