Researchers would like to assess the overall health of white pine trees in a state park. Which of the following methods for choosing the trees to assess would be considered a convenience sample?

A convenience sample is chosen because the subjects are easy to reach, rather than selected randomly. The 100 trees closest to the ranger station are convenient to assess, so choice D is a convenience sample. Choices B and C use random selection, while A assesses every tree in the park.

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