Which of these oceanic landforms is similar to a canyon?
a) valley
b) seamount
c) ocean trench
d) the mid-ocean ridge

I'm leaning towards C) ocean trench 
hope this helps. c:

I would say C too. But d may seem like a good answer thought too

Nps pollution is caused by rainfall or snowmelt moving over and through the ground. nonpoint source pollution can include: excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. oil, grease and toxic chemicals from urban runoff and energy production