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:
Dunes are of ____ types - linear and parabolic.\Question: Choose the right answer from options given a) three b) four c) ten d) two

Ex Output:
d


Ex Input:
Diploid cultivars have ____ alleles.\Question: Choose the right answer from options given a) eight b) six c) two d) five

Ex Output:
c


Ex Input:
Some dogs can jump ____ feet in the air from a sitting position.\Question: Choose the right answer from options given a) nine b) six c) five d) no

Ex Output:

b