To simplify the expression \(\sqrt{18} + 5\sqrt{2}\), we first simplify \(\sqrt{18}\):
\[ \sqrt{18} = \sqrt{9 \times 2} = \sqrt{9} \times \sqrt{2} = 3\sqrt{2} \]
Now we can rewrite the original expression:
\[ \sqrt{18} + 5\sqrt{2} = 3\sqrt{2} + 5\sqrt{2} \]
Next, we can combine the like terms:
\[ 3\sqrt{2} + 5\sqrt{2} = (3 + 5)\sqrt{2} = 8\sqrt{2} \]
Thus, the simplified expression is \(8\sqrt{2}\).
The correct choice is:
B. The terms cannot be simplified.
However, since we were able to combine and simplify the terms to \(8\sqrt{2}\), the correct answer should acknowledge that simplification was possible, leading to an expression in its simplest form. The original phrasing of option B seems to suggest no simplification could occur, but in summary, we see that \(8\sqrt{2}\) is indeed a simplified result from the original expression.