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:
Cleavage is perfect in ____ directions, prismatic.\Question: Choose the right answer from options given a) two b) nine c) three d) seven

Ex Output:
a


Ex Input:
Nymphs emerge in ____ to seven days and flatten themselves against the leaf to feed.\Question: Choose the right answer from options given a) one b) five c) nine d) two

Ex Output:
b


Ex Input:
Rural children face the highest danger of drowning at ____ times the rate of urban children.\Question: Choose the right answer from options given a) seven b) ten c) three d) zero

Ex Output:

c