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:
Basting is the stitching used to hold the ____ layers of fabric together while quilting.\Question: Choose the right answer from options given a) four b) six c) three d) ten

Ex Output:
c


Ex Input:
Serial transfer is the sequential transmission of the ____ bit-voltages that constitute a byte.\Question: Choose the right answer from options given a) ten b) eight c) two d) four

Ex Output:
b


Ex Input:
Lobsters have eight walking legs and ____ legs bearing claws.\Question: Choose the right answer from options given a) six b) two c) four d) no

Ex Output:

b