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: Reality is more than what can be perceived with the ____ senses.\Question: Choose the right answer from options given a) five b) four c) ten d) one

Output: a


Input: Consider Input: Most children improve in three to ____ days.\Question: Choose the right answer from options given a) seven b) six c) four d) ten

Output: a


Input: Consider Input: Many scientists divide satellites into ____ main groups based on their geologic history.\Question: Choose the right answer from options given a) four b) zero c) one d) eight


Output: a