Up to what point will a profit-maximizing company continue to invest?

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When the borrowing cost matches the marginal efficiency of capitalWhen the borrowing cost exceeds the marginal efficiency of capitalWhen the borrowing cost is lower than the marginal efficiency of capitalWhen the borrowing cost equals the marginal propensity to consume

Explanation

A firm aiming to maximize profits will keep investing as long as the cost of borrowing is less than the marginal efficiency of capital. If borrowing costs rise above this efficiency, further investment would reduce profits. Therefore, investment continues until borrowing costs are no longer below the marginal efficiency of capital.