To answer this question, let's analyze each option:
Option A) Perfect square - This option is incorrect. Adding an odd number to itself an odd number of times does not necessarily result in a perfect square. For example, if we add 3 to itself 3 times, we get 3 + 3 + 3 + 3 = 12, which is not a perfect square.
Option B) Even number - This option is incorrect. Adding an odd number to itself an odd number of times will always result in an odd number. For example, if we add 3 to itself 3 times, we get 3 + 3 + 3 + 3 = 12, which is an odd number.
Option C) Odd number - This option is correct. Adding an odd number to itself an odd number of times will always result in an odd number. For example, if we add 3 to itself 3 times, we get 3 + 3 + 3 + 3 = 12, which is an odd number.
Option D) Prime number - This option is incorrect. Adding an odd number to itself an odd number of times does not necessarily result in a prime number. For example, if we add 3 to itself 3 times, we get 3 + 3 + 3 + 3 = 12, which is not a prime number.
Therefore, the correct answer is option C) Odd number. This option is correct because adding an odd number to itself an odd number of times will always result in an odd number.