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: Bucks grow antlers each year that reach ____ to six feet in spread.\Question: Choose the right answer from options given a) seven b) one c) three d) five
Example Output: d

Example Input: Parliaments can last five years, often last ____ and a bit.\Question: Choose the right answer from options given a) four b) three c) five d) two
Example Output: a

Example Input: Plants can grow and lose leaves four or ____ times in a year depending on rainfall.\Question: Choose the right answer from options given a) no b) three c) ten d) five
Example Output:
d