Ocean basins are characterized by a central consisting of submarine hills that rise gradually to a rugged central zone delineated by a narrow, trench-like feature called a(n)

Mid-oceanic ridge and a ridge

Explaination:

The mid ocean ridge is where seafloor spreading takes place along a divergent plate boundary.

They are usually formed by plate tectonics with a depth of about 2,600 meters (8,500 ft) and rises about two kilometers above the deepest portion of an ocean basin.

A rift represents a lowland region that forms where Earth's tectonic plates move apart, or rift. An example is the Rhine rift valley in Germany.

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