The correct response that supports the theory of plate tectonics is:
Around that time, those regions were located in tropical climates that were partially submerged on the coasts.
This observation supports the theory of plate tectonics because it implies that the continents were positioned differently in the past, allowing for the formation of coal deposits in tropical environments where vegetation could thrive and later be buried and transformed into coal. This aligns with plate tectonics, which explains the movement and interaction of Earth's lithospheric plates over geological time.