Choice A is the correct answer.

1. Factor: $(x - 2)(x - 3) \leq 0$.
2. Roots: 2 and 3.
3. Parabola opens upward, so it is negative between the roots.
4. Solution: $2 \leq x \leq 3$.

Choice B is incorrect. Choice C is incorrect because it excludes endpoints. Choice D is incorrect.