Correct Option
The correct option is Seamount.
Explanation
A seamount is an underwater mountain rising from the ocean floor but not reaching the ocean surface.
The Emperor Seamount Chain is an extension of the Hawaiian Islands in the Pacific Ocean and consists of submerged volcanic mountains formed over a hotspot. Such volcanic elevations below sea level are classified as seamounts.
- Atoll: Incorrect. An atoll is a ring-shaped coral reef or island surrounding a lagoon.
- Mid-Oceanic Ridge: Incorrect. A mid-oceanic ridge is a long submarine mountain chain formed mainly along divergent plate boundaries.
- Seamount: Correct. The Emperor Seamount is a submerged volcanic mountain and is therefore an example of a seamount.
- Guyot: Incorrect. A guyot is a flat-topped seamount produced by erosion and later subsidence; the given relief feature is identified broadly as a seamount.
Key Takeaway: A seamount is a submerged volcanic mountain, while a guyot is its flat-topped form.