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: Quarks also come in ____ 'colours', terms for a property a little like electrical charge.\Question: Choose the right answer from options given a) three b) nine c) six d) no

Output: a


Input: Consider Input: Astronauts sleep only ____ hours each night, on average.\Question: Choose the right answer from options given a) six b) one c) four d) seven

Output: a


Input: Consider Input: City ordinances limit the number of domestic animals to ____ per household.\Question: Choose the right answer from options given a) ten b) six c) four d) zero


Output: c