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:
Litters contain from one to ____ kittens, and tend to be much larger when prey is abundant.\Question: Choose the right answer from options given a) three b) four c) two d) seven

Ex Output:
b


Ex Input:
Verbs have ____ functions in sentences.\Question: Choose the right answer from options given a) two b) eight c) no d) ten

Ex Output:
a


Ex Input:
All mammals have at least ____ legs.\Question: Choose the right answer from options given a) one b) zero c) two d) five

Ex Output:

c