Question

at which point is crust neither created nor destroyed?
island chain
mid - ocean ridge
divergent boundary
transform boundary

Explanation:

At a transform boundary, tectonic plates slide past each other horizontally. There is no creation (as at mid - ocean ridges/divergent boundaries where new crust is formed) or destruction (as at subduction zones associated with convergent boundaries) of crust. Island chains can be formed at convergent boundaries (e.g., volcanic island arcs). Mid - ocean ridges are divergent boundaries where new crust is created. Divergent boundaries are associated with crust creation.

Answer:

transform boundary