The mariana trench is an example of a a. paleo-coast. b. continental slope. c. deep ocean canyon. d. continental shelf.

Option C. Deep ocean canyon

Explanation:

The Mariana Trench is an example of a deep ocean canyon

Deep ocean canyon is found in Mariana Trench.

Option C

Explanation:

The ''Mariana Trench'' can be found in the western ''Pacific Ocean'' which is nearly about 200 kilometers east of ''Marian Islands''. It is considered as the "deepest trench in the world". It is crescent-shaped canyon of about 2,550 km and an average width of 69 km.  

It is true that mariana trench is an example of a deep ocean canyon and it is formed by the fusion of sub-merging of the Eurasian plate and the Philippine Plate. Not all trenches are as deep as Mariana Islands. The descend part of the Marian is called Challenger Deep and it covers most of the southern part of trench.