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: Owls have ____ toes on each foot, like most birds.\Question: Choose the right answer from options given a) no b) seven c) four d) one

Output: c


Input: Consider Input: Atoms are extremely small, on the order of a few ____ billionths of a meter.\Question: Choose the right answer from options given a) ten b) seven c) nine d) eight

Output: a


Input: Consider Input: Arthropods are made up of four groups of living animals and ____ group of extinct animals.\Question: Choose the right answer from options given a) one b) four c) six d) no


Output: a