What happens when an oceanic plate moves over a hotspot?

“A hot spot develops above the plume. Magma generated by the hot spot rises through the rigid plates of the lithosphere and produces active volcanoes at the Earth's surface. As oceanic volcanoes move away from the hot spot, they cool and subside, producing older islands, atolls, and seamounts.” Oregon State University

The correct answer is:   [b]:   "has no atmosphere" .