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: Orangutans spend up to ____ hours a day eating or foraging for food.\Question: Choose the right answer from options given a) seven b) nine c) three d) six
Example Output: d

Example Input: Habitat destruction is a concern for all ____ gorilla subspecies.\Question: Choose the right answer from options given a) no b) four c) three d) five
Example Output: b

Example Input: Sharpshooters are a mix of powder burners and ____ year old kids.\Question: Choose the right answer from options given a) four b) five c) three d) no
Example Output:
b