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').

Input: Consider 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

Output: c


Input: Consider Input: Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven

Output: c


Input: Consider Input: Univalves have ____ shell, and bivalves have two shells.\Question: Choose the right answer from options given a) two b) one c) nine d) no


Output: b