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: 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: Right whales are slow swimmers, averaging just ____ miles per hour.\Question: Choose the right answer from options given a) nine b) six c) two d) five
Example Output: b

Example Input: Biennials require ____ growing seasons to complete their life cycles.\Question: Choose the right answer from options given a) two b) eight c) zero d) four
Example Output:
a