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').

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

Output: a


Input: Consider 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

Output: b


Input: Consider Input: Wool continues as it has for the last ____ thousand years, as the premier clothing fibre.\Question: Choose the right answer from options given a) ten b) two c) one d) three


Output: a