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: Cougars have ____ toes with three distinct lobes present at the base of the pad.\Question: Choose the right answer from options given a) no b) four c) eight d) zero
Example Output: b

Example Input: Litters contain from one to ____ kittens, and tend to be much larger when prey is abundant.\Question: Choose the right answer from options given a) three b) four c) two d) seven
Example Output: b

Example Input: Some mounds contain ____ eggs and are referred to as test redds, false redds, or scrapes.\Question: Choose the right answer from options given a) no b) four c) eight d) zero
Example Output:
a