Question

A transform boundary is a place where

geologic plates are formed
geologic plates are melted
geologic plates slide past each other
geologic plates make mountains

Answer 1

I hope this helps, if you still don't understand I can better explain by process of elimination
:)
http://geology.com/nsta/transform-plate-boundaries.shtml

Answer 2

Transform boundaries are places where plates slide sideways past each other. At transform boundaries lithosphere is neither created nor destroyed. Many transform boundaries are found on the sea floor, where they connect segments of diverging mid-ocean ridges. California's San Andreas fault is a transform boundary.

So I Believe your answer will be C- geologic plates slide past each other