According to the information in the text, it can be inferred that the subtitle is Spring Tides (option C).
A subtitle is a second-order title that is used as an informative medium, to expand the idea of a particular topic, or to point to a specific discussion.
According to the above, it can be inferred that Spring Tides is a subtitle because it establishes a signal for the deepening of this topic in the text that talks about the tides.
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