56. The work function for a certain sample is 2.3 eV. The stopping potential for electrons ejected from the sample by 6.0 × 1014 Hzelectromagnetic radiation is (c = 3.00 × 108 m/s):
(A) 0 V
(B) 0.18 V
(C) 0.36 V
(D) 2.0 V
(E) 3.6 V