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: Heat pumps give off ____ fumes or harmful products of combustion.\Question: Choose the right answer from options given a) four b) zero c) six d) no

Output: d


Input: Consider Input: Blankets can take up to ____ days to dry in the colder months.\Question: Choose the right answer from options given a) eight b) three c) two d) nine

Output: b


Input: Consider Input: Natural resources can be of ____ types.\Question: Choose the right answer from options given a) five b) three c) two d) nine


Output: b