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: Hybridization is the practice of ____ different species interbreeding.\Question: Choose the right answer from options given a) no b) one c) two d) three

Output: c


Input: Consider Input: Radiation accounts for ____ thirds of the heat loss.\Question: Choose the right answer from options given a) four b) one c) three d) two


Output: d