Answer :
If a nation moves upward along its per-worker production function relating output per worker to capital per worker, then, the option d. the productivity of capital rises.
When a nation moves upward along its per-worker production function relating output per worker to capital per worker, it means that the nation is increasing its capital per worker while holding other factors constant. As a result, the productivity of capital rises.
By increasing the amount of capital per worker, the nation is providing workers with more tools, equipment, and resources to work with, which enhances their productivity. The additional capital enables workers to produce more output for each unit of labor input.
Therefore, the correct answer is d. the productivity of capital rises.
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