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: Gasoline is ____ times as expensive as in the United States.\Question: Choose the right answer from options given a) two b) four c) three d) ten
Example Output: c

Example Input: Chacoan peccaries are the largest of the ____ peccary species.\Question: Choose the right answer from options given a) eight b) three c) ten d) no
Example Output: b

Example Input: Albino barbs are a light yellow with ____ barely visible stripes.\Question: Choose the right answer from options given a) four b) five c) ten d) three
Example Output:
a