Which one of the following is a true statement? A) If a particle is classically forbidden from a certain region, then the probability of finding it in that region will be zero, according to quantum mechanics. B) It is impossible to determine both the position and the momentum of a particle to arbitrary precision, according to quantum mechanics. C) Only large numbers of photons behave as probability waves; single photons follow the trajectory predicted by geometric optics. D) Heisenberg's uncertainty principle tells us that the probability of finding a particle is proportional to the square of its wave function. E) The de Broglie wavelength of an electron of energy E is the same as the wavelength of a photon of the same energy