Pick out the correct statement.
(A) Positron is the antiparticle of electron
(B) In α-decay, the ratio of neutron to proton decreases
(C) Ionising power of β-rays is higher than that of α-rays
(D) Speed of α-rays is more than that of γ-ray
(A) Positron is the antiparticle of electron
(B) In α-decay, the ratio of neutron to proton decreases
(C) Ionising power of β-rays is higher than that of α-rays
(D) Speed of α-rays is more than that of γ-ray