The best statement explaining the relationship between the underlined text on pages 2 and 4 is: The text on page 2 makes a broad claim that the text on page 4 supports with specific details.
What is the passage about?
Page 2 makes a broad claim about humans harnessing oceanic motion for energy. Page 4 then provides specific examples of these two forms of oceanic motion: tides and waves. This supports the claim made earlier without introducing contradictory information, proposing solutions, or describing hypothetical processes.
Therefore, the relationship between the underlined text is best described as the broad claim on page 2 being supported by the specific details on page 4.