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: Angiosperms inhabit all ____ continents, as well as the oceans.\Question: Choose the right answer from options given a) five b) seven c) three d) zero

Output: b


Input: Consider Input: Chlorine has ____ naturally occurring isotopes.\Question: Choose the right answer from options given a) nine b) eight c) three d) two

Output: d


Input: Consider Input: Corrosion inhibitors do ____ things.\Question: Choose the right answer from options given a) two b) five c) one d) nine


Output: a