Question

which type of basin forms at transform boundaries?
rift
wedge
arc
strike - slip

Explanation:

Strike - slip basins form at transform boundaries. Transform boundaries are where two tectonic plates slide past each other horizontally. Strike - slip basins are associated with this type of plate movement. Rift basins form at divergent boundaries (where plates move apart). Wedge basins are not typically associated with transform boundaries. Arc basins are related to convergent boundaries (subduction zones where one plate is forced under another).

Answer:

strike - slip