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: Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero
Example Output: b

Example Input: Chacoan peccaries are the largest of the ____ peccary species.\Question: Choose the right answer from options given a) eight b) three c) ten d) no
Example Output: b

Example Input: Some soft ticks pass through up to ____ nymphal molts before they become adults.\Question: Choose the right answer from options given a) three b) one c) seven d) eight
Example Output:
c