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:
Waves can sometimes reach ____ feet tall, while still being playful and fun.\Question: Choose the right answer from options given a) nine b) eight c) ten d) no

Ex Output:
c


Ex Input:
Batteries consist of ____ electrodes immersed in an electrolyte.\Question: Choose the right answer from options given a) two b) eight c) three d) seven

Ex Output:
a


Ex Input:
Nuclear power releases almost ____ gaseous componants.\Question: Choose the right answer from options given a) three b) six c) no d) five

Ex Output:

c