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: Copper is ____ times higher in dog liver than in human liver.\Question: Choose the right answer from options given a) three b) ten c) six d) one
Example Output: b

Example Input: Some programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three
Example Output: c

Example Input: Protists show the ____ basic types of sexual life cycles, with some other variants, too.\Question: Choose the right answer from options given a) seven b) six c) three d) no
Example Output:
c