Question

which feature do you usually see when tectonic plates move apart?
volcanoes
new ocean ridges and seafloor
earthquakes
mountains

Explanation:

When tectonic plates move apart (divergent boundary), magma rises to fill the gap, creating new oceanic crust, which forms new ocean ridges and seafloor. Volcanoes, earthquakes, and mountains are more associated with convergent or transform boundaries (plates colliding or sliding past), not divergent (moving apart) ones.

Answer:

B. new ocean ridges and seafloor