Which part of Earth's cumulative hypsographic curve includes the continental shelves of passive margins?

The shallowest slope below sea level

Explanation:

A passive margin is the transition between oceanic and continental lithosphere that is not an active plate margin.

A passive margin forms by sedimentation above an ancient rift, now marked by transitional lithosphere.

Passive continental margins are characterized by wide beaches, barrier islands, broad coastal plains.

The Atlantic Coast of the United States is a passive continental margin.