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').

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

Example Input: Statistics show that within ____ years of divorce, many people marry a second time.\Question: Choose the right answer from options given a) four b) nine c) six d) three
Example Output: d

Example Input: Seaweed shares ____ diseases with land plants.\Question: Choose the right answer from options given a) five b) seven c) no d) ten
Example Output:
c