The main purpose of lines 26 through 28 ("the amount....labor") is to explain a term. The correct answer is D.
Given a passage shown in the attached pictures.
Option D is the best answer. The second sentence of the third paragraph reads: "In economics, productivity - the number of economic value produced for a given unit of input, such as an hour of labor - is an important indicator of growth and wealth creation." In this context, the main purpose of the subtitle ("quantity of economic value ... such as an hour of labor") is to determine "productivity".
The options other than D are A, B and C are incorrect because in the context of the third paragraph the statement asserts ("the amount of economic value. . . such as one hour of work") is explicitly provided to help explain the term "productivity", not to describe a process (option A), highlighting a dilemma (option B) or clarify a statement (option C).
Hence, the main purpose of lines 26 to 28 ("amount... .labor") of the given passage explains a term.
Learn more about the passage from here brainly.com/question/12555695
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