To find the slant height of a cone, you typically use the Pythagorean Theorem, where the slant height \( l \) is the hypotenuse of a right triangle formed by the radius \( r \), height \( h \), and the slant height itself. The formula is:
\[ l = \sqrt{r^2 + h^2} \]
It seems you have some options listed. If you provide the radius and height of the cone, I can help you compute the slant height and tell you which of the provided options is correct. If you only need a solution based on the information given, I cannot determine the answer without those specific dimensions.