I think it should be B but I’m probably wrong so risk it if you want sorry
To find the lateral surface area of a pyramid, you can find the area of each triangle, A = 1/2bh or A = 1/2lw, then multiply by the number of triangles, which would be based on the number of sides of the base; or you can take half the perimeter and multiply by the slant height.
Use distance formula
=√(3-3)^2 +(-4-4)^2
=√64
=8