Question

select the word in the sentence that means \a line that marks the limits of an area.\ she planted the soles of her feet on the mat and did two flips. dana landed perfectly, but her heel fell outside the boundary line of the mat, so she was penalized.

Explanation:

The question is about identifying a word that means "a line that marks the limits of an area." In the context of the sentence provided, "boundary line" fits this description as it refers to a line that demarcates an area's limits.

Answer:

boundary line