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').

Input: Consider Input: Tilt consists of ____ small surface vents.\Question: Choose the right answer from options given a) zero b) three c) seven d) no

Output: b


Input: Consider Input: Young children suffer from an average of six to ____ colds a year.\Question: Choose the right answer from options given a) ten b) eight c) two d) one

Output: b


Input: Consider Input: All insects have three pairs of legs and ____ body regions, head, thorax, and abdomen.\Question: Choose the right answer from options given a) ten b) three c) four d) nine


Output: b