According to the mantle plume theory, how do volcanic island chains, like the hawaiian islands, form volcanic island chains form as a tectonic plate moves over a stationary hot spot. volcanic island chains form where tectonic plates spread apart. volcanic island chains form when one tectonic plate is subducted beneath another. volcanic island chains form along a spreading crack in the seafloor.

The correct answer is - Volcanic island chains form as a tectonic plate moves over a stationary hot spot.
When the tectonic plate moves above a stationary hot spot it does not affect the activity of the hot spot, it only affects in the spreading process as it moves, in the sense of making the magma that comes out of the hot spot move along with the plate little by little, thus creating one volcanic island, after that another one, and another one, and so on, so a chain of volcanic islands is formed over time.