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: Nightmares happen frequently in childhood, especially between the ages of ____ and six.\Question: Choose the right answer from options given a) three b) eight c) no d) ten

Output: a


Input: Consider Input: Elk retain their antlers for more than ____ months of the year.\Question: Choose the right answer from options given a) nine b) ten c) six d) seven

Output: c


Input: Consider Input: Hummingbirds feed throughout the day, at intervals as often as every ____ to twelve minutes.\Question: Choose the right answer from options given a) seven b) eight c) five d) three


Output: b