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:
Baby elephants are usually dependent on mother s milk for at least ____ years.\Question: Choose the right answer from options given a) six b) three c) two d) seven

Ex Output:
b


Ex Input:
Food chains consist of ____ trophic levels.\Question: Choose the right answer from options given a) ten b) three c) one d) four

Ex Output:
d


Ex Input:
Inflorescence is a condensed cyme with five to ____ flowers and axillary in position.\Question: Choose the right answer from options given a) nine b) ten c) five d) one

Ex Output:

b