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: Turkey also has ____ inland drainage basins.\Question: Choose the right answer from options given a) zero b) two c) eight d) nine
Example Output: b

Example Input: Gasoline is ____ times as expensive as in the United States.\Question: Choose the right answer from options given a) two b) four c) three d) ten
Example Output: c

Example Input: Many Organisms display ____ of the three types described above.\Question: Choose the right answer from options given a) three b) two c) ten d) seven
Example Output:
b