Final answer:
The expression 4n^2 + 25 + 6 is simplified by combining the constants 25 and 6 to get 4n^2 + 31, which corresponds to option A.
Step-by-step explanation:
To simplify the expression 4n^2 + 25 + 6, you should combine the like terms. The terms 25 and 6 are both constants and can be added together.
So, when we add 25 and 6, we get 31. The expression now becomes 4n^2 + 31, which is its simplest form as there are no more like terms to combine.
Therefore, the simplified expression is 4n^2 + 31, which corresponds to option A.