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: Guinea has ____ territories or colonies.\Question: Choose the right answer from options given a) no b) seven c) three d) eight
Example Output: a

Example Input: Black women die from cervical cancer at ____ times the rate of white women.\Question: Choose the right answer from options given a) five b) one c) two d) three
Example Output: d

Example Input: Trees can help reduce the greenhouse effect in ____ ways.\Question: Choose the right answer from options given a) no b) zero c) two d) five
Example Output:
c