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: Big bluestem grows up to ____ feet tall.\Question: Choose the right answer from options given a) seven b) no c) nine d) eight

Output: c


Input: Consider Input: Snowflakes are crystals that have many different shapes, but each snowflake has ____ points on it.\Question: Choose the right answer from options given a) six b) nine c) one d) seven

Output: a


Input: Consider Input: Astronomers believe that ____ binary star systems they have observed probably contain black holes.\Question: Choose the right answer from options given a) eight b) no c) seven d) six


Output: c