Question

which type of plate boundary involves two tectonic plates moving away from each other?

Explanation:

A divergent boundary occurs when two tectonic plates move away from each other. At such boundaries, new crust is formed as magma rises from the mantle to fill the gap. This process is often associated with mid - ocean ridges.
A transform boundary is where plates slide past each other horizontally. A convergent boundary is where plates move towards each other, and a lateral boundary is not a standard term for plate boundaries in the context of plate tectonics.

Answer:

C. Divergent Boundary