**Core Concept**
The resolution of light microscopy is limited by the wavelength of light and the numerical aperture of the objective lens. This fundamental principle governs the maximum detail that can be visually resolved using a light microscope.

**Why the Correct Answer is Right**
The correct answer is based on the Abbe's diffraction limit, which states that the minimum resolvable distance (d) is directly proportional to the wavelength of light (λ) and inversely proportional to the numerical aperture (NA) of the objective lens. The formula is d = 0.61 λ / NA. This means that the resolution of light microscopy is inherently limited by the physical properties of light and the design of the microscope.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the fundamental limit of light microscopy resolution.
**Option B:** This option is incorrect because it implies that resolution can be improved arbitrarily with better optics, which is not the case due to the Abbe's diffraction limit.
**Option C:** This option is incorrect because it suggests that resolution is solely dependent on the magnification power of the microscope, which is not the primary limiting factor.

**Clinical Pearl / High-Yield Fact**
A common exam trap is to confuse resolution with magnification. While magnification can increase the apparent size of objects, it does not improve the resolution of detail. Remember that resolution is limited by the Abbe's diffraction limit, which is a fundamental physical constraint.

**Correct Answer: D. 0.2 micrometers**