Answer is D: Electronic microscope
An electronic microscope has greater resolving power and much higher magnifications. Most high-resolution electron microscope cannot be used to image living cells because the particle beam of powerful electrons used to illuminate a specimen also destroys the samples. Engineers, however, are coming up with ways to overcome this critical limitation by using quantum mechanical measurement. Quantum mechanical measurement will help avoid damage to the specimen by sensing objects remotely without ever hitting the imaged object.
