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').

Ex Input:
Fluorescent lamps are roughly ____ times more intense than ordinary lightbulbs.\Question: Choose the right answer from options given a) six b) one c) three d) eight

Ex Output:
c


Ex Input:
Ales actively ferment with yeast for two to ____ days.\Question: Choose the right answer from options given a) five b) nine c) three d) six

Ex Output:
c


Ex Input:
Aardvarks have ____ toes on the front feet and five toes on their back feet.\Question: Choose the right answer from options given a) zero b) ten c) four d) no

Ex Output:

c