Nonlinear functions SAT question

Choice A is correct. It's given that the function $f(x)=200,000{(1.21)}^x$ gives a company's predicted annual revenue, in dollars, $x$ years after the company started selling light bulbs online. It follows that $f(x)$ represents the company's predicted annual revenue, in dollars, $x$ years after the company started selling light bulbs online. Since the value of $f(5)$ is the value of $f(x)$ when $x=5$, it follows that "$f(5)$ is approximately equal to $518,748$" means that $f(x)$ is approximately equal to $518,748$ when $x=5$. Therefore, the best interpretation of the statement "$f(5)$ is approximately equal to $518,748$" in this context is $5$ years after the company started selling light bulbs online, its predicted annual revenue is approximately $518,748$ dollars.

Choice B is incorrect and may result from conceptual errors.

Choice C is incorrect and may result from conceptual errors.

Choice D is incorrect and may result from conceptual errors.