19. What information below is needed to calculate the wavelength of a hydrogen atom excited from level n=2 to n=5? (i) the electromagnetic spectrum; (ii) the change in energy from n = 2 to n = 5; (iii) Planck's constant (iv) mass of the hydrogen electron; (v) the speed of light (A) (i) & (iii) & (v), (B) (ii) & (iii) & (v), (C) (i) & (ii) & (iv), (D) (ii) & (iii) & (iv) & (v), (E) all of them