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:
Youth unemployment is ____ times the adult level.\Question: Choose the right answer from options given a) one b) three c) seven d) no

Ex Output:
b


Ex Input:
Blood pressure is measured by ____ numbers.\Question: Choose the right answer from options given a) zero b) eight c) two d) seven

Ex Output:
c


Ex Input:
Tardigrades can survive more than ____ years without water.\Question: Choose the right answer from options given a) four b) zero c) ten d) three

Ex Output:

c