15. The Schrodinger equation of a harmonic oscillator is= Εψ,where x is displacement from the equilibrium position, m is mass and k is force constant. Which following statement is wrong? (A). The vibrational frequency is proportional to . (B). The zero-point energy is not equal to zero. (C). The total energy is linearly proportional to vibrational frequency. (D). The expectation value of x, ＜x＞, is equal to zero. (E). The degeneracy of each energy level is two.