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').

Example 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
Example Output: a

Example Input: Most roots require from ____ to six weeks to dry sufficiently to be safe.\Question: Choose the right answer from options given a) two b) four c) eight d) three
Example Output: d

Example Input: Young walleye have six or ____ dark saddle marks on their backs.\Question: Choose the right answer from options given a) seven b) three c) zero d) two
Example Output:
a