They can ride above the tree line at New River Gorge in West Virginia. Based on the text, which phrase below describes the technical meaning of the term tree line" as it is used in the passage?

a
bottom of the river
b
trees in a nursery
c
boundary beyond which trees cannot grow
d
one row of trees

C. Boundary beyond which trees cannot grow.

Explanation:

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The term tree line refers to the boundary beyond which trees cannot grow. Before the line, you can encounter at least some species of trees, but after it, there are none. This is usually caused by environmental conditions trees can't survive in, such as extremely low temperatures, too much snow, or lack of moisture.

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