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: Material culture is the realm of ____ dimensional objects that make up our everyday environment.\Question: Choose the right answer from options given a) ten b) three c) six d) four
Example Output: b

Example Input: All butterflies go through ____ distinct stages in their lives.\Question: Choose the right answer from options given a) eight b) seven c) four d) three
Example Output: c

Example Input: R is an average of the color rendering ability of ____ or more specific colors.\Question: Choose the right answer from options given a) no b) three c) eight d) two
Example Output:
c