The quotation that most effectively illustrates the claim of the rock intending to confront and restrain the sea is:
(Choice D) “I am the Rock, presumptuous Sea! / I am set to encounter thee. / Angry and loud or gentle and still, / I am set here to limit thy power, and I will!”
This choice directly expresses the rock's intention to confront and limit the sea's power, aligning perfectly with the assertion in the question.