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:
Hybridization is the practice of ____ different species interbreeding.\Question: Choose the right answer from options given a) no b) one c) two d) three

Ex Output:
c


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:
Nanos activity is found in the posterior poleplasm of ____ diverse Dipteran species.\Question: Choose the right answer from options given a) five b) one c) eight d) six

Ex Output:

a