What is the only sea without a coastline?

Here is the question :

WHAT IS THE ONLY SEA WITHOUT A COASTLINE?

Here is the option for the question :

Caspian Sea
East China Sea
Coral Sea
Sargasso Sea

The Answer:

And, the answer for the the question is :

Sargasso Sea

Explanation:

[STC0012098]. Only one sea does not have an adjacent landmass. The Sargasso Sea, which is part of the Atlantic Ocean, deserves this honor. While most types of seaweed reproduce on the ocean floor, the Sargasso Sea takes its name from a patch of seaweed that floats freely in the water.