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: Photosynthesis occurs in ____ phases.\Question: Choose the right answer from options given a) four b) two c) nine d) five

Output: b


Input: Consider Input: Righteousness always points in ____ directions.\Question: Choose the right answer from options given a) six b) two c) one d) four

Output: b


Input: Consider Input: Social organization is complex, described as being structured into ____ levels.\Question: Choose the right answer from options given a) ten b) three c) no d) two


Output: b