The correct option is D 0.025 ˚A
The resolving power of the microscope depends on the wavelength of light used and the numerical aperture of the objective. In case of electron microscope, the wavelength is very low (0.05 nm), so the resolution reaches upto 1.0 nm. Or one can say, the electron microscope resolves upto 0.001 m.
Therefore, the correct answer is option D.