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: Water softeners add sodium to drinking water in ____ ways.\Question: Choose the right answer from options given a) zero b) six c) two d) nine

Output: c


Input: Consider Input: Stringers consist of ____ narrow pieces of wood glued together.\Question: Choose the right answer from options given a) ten b) three c) five d) seven

Output: b


Input: Consider Input: Milk chocolate keeps for about a year and white chocolate for ____ or eight months.\Question: Choose the right answer from options given a) no b) six c) ten d) seven


Output: d