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: Today there are ____ major breweries in Mexico that produce a spectrum of tasty beverages.\Question: Choose the right answer from options given a) nine b) six c) zero d) eight
Example Output: b

Example Input: Diarrheal disease kills ____ million children every year.\Question: Choose the right answer from options given a) three b) no c) four d) ten
Example Output: a

Example Input: Waves reach ____ feet in height.\Question: Choose the right answer from options given a) no b) one c) three d) zero
Example Output:
c