The Mariana Trench, located in the Pacific Ocean, is the deepest known spot on Earth. What kind of plate boundary is it?
A. A denser oceanic plate converging with a less dense continental plate
B. A continental plate converging with a less dense continental plate
C. An oceanic plate converging with another oceanic plate having about the same density
D. An oceanic plate diverging from another oceanic plate having about the same density