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:
Children now account for only ____ percent of all forest fires caused in the United States.\Question: Choose the right answer from options given a) five b) four c) eight d) nine

Ex Output:
b


Ex Input:
All spider mites have ____ legs and a lack of a separate head.\Question: Choose the right answer from options given a) eight b) four c) ten d) one

Ex Output:
a


Ex Input:
Roots provide ____ important functions for the plant.\Question: Choose the right answer from options given a) zero b) two c) four d) seven

Ex Output:

b