PLZ HELP ASAP WILL GIVE BRANLIEST

an ocean trench:
a) is the site of submarine volcanoes.
b) occurs when a plate is moving down.
c) marks the upwelling of mantle material
d) started the breakup of the single southern continent

The best answer is C.

Explanation:

Submarine volcanoes are their own different things, An ocean trench doesn't occur when plates move down but when two or more platonic plates meet, and trenches don't start the breakup of the single southern continent. So C is your best answer.

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rain should be the answer.