By inference, the meaning of “happy” as used in the excerpt is: "enduring" (Option C)
It is to be noted that an inference is the conclusion that is reached after a logical and rational analysis of the text has been carried out.
It is to be noted that "happy" in the excerpt is the application of Anthropomorphism - the application of human traits to non-human entities.
The textual evidence for the above is "What healthy marshes shared most of all was vegetation distributed on the higher end across low-to-high landscape elevations"
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