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').

Example Input: Plants can uptake ____ times more nutrients, and improve soil texture at the same time.\Question: Choose the right answer from options given a) no b) two c) three d) ten
Example Output: d

Example Input: Sexual reproduction is varied in ____ ways.\Question: Choose the right answer from options given a) seven b) two c) five d) three
Example Output: d

Example Input: Overweight people outnumber underweight people by more than ten to ____ in North America.\Question: Choose the right answer from options given a) eight b) three c) one d) seven
Example Output:
c