Final answer:
The limit as x approaches 0 from the right of tan(x) is undefined.
Step-by-step explanation:
The limit as x approaches 0 from the right of tan(x) is undefined.
To understand why, let's consider the graph of the tangent function. As x approaches 0 from the right, the values of tan(x) become increasingly large (positive or negative) without bound. This means that there is no finite value that tan(x) approaches, so the limit is undefined.
Therefore, the correct answer is D. Undefined.