Final answer:
To evaluate 5 2, simply multiply the base (5) by itself, resulting in 25.
Step-by-step explanation:
To evaluate 5 2, we need to multiply the base for that exponent by itself. In this case, the base is 5 and the exponent is 2. So, 52 = 5 x 5 = 25. Therefore, the option '5 2 = 25' is correct.