Final answer:
The correct answer to how the change in market value of land affects Martin Co.'s accounting equation is: C. NA = NA + NA + NA, as the increased market value is not recorded in the accounting equation until the gain is realized.
Step-by-step explanation:
The question involves understanding how a change in the market value of an asset affects a company's accounting equation: Assets = Liabilities + Common Stock + Retained Earnings. In this scenario, Martin Co. purchased land for $75,000, but by the end of the current reporting period, the land's appraised value increased to $100,000.
However, under generally accepted accounting principles (GAAP), an increase in the market value of an asset like land is not typically recorded until the gain is realized through a transaction, such as selling the land. Therefore, the change in market value does not impact the accounting equation until the gain is realized. The correct choice is C. NA = NA + NA + NA, indicating that there is no effect on any component of the equation as a result of the unrealized gain.