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: Vaporization can occur in temperatures as low as ____ degrees.\Question: Choose the right answer from options given a) one b) zero c) eight d) two

Output: b


Input: Consider Input: Poisons come in ____ different forms .\Question: Choose the right answer from options given a) four b) no c) five d) ten

Output: a


Input: Consider Input: Harmony occurs when ____ or more sounds are heard simultaneously.\Question: Choose the right answer from options given a) zero b) three c) ten d) two


Output: d