$$\alpha$$-particle consists of :
A
2 protons and 2 neutrons only
B
2 electrons, 2 protons and 2 neutrons
C
2 electrons and 4 protons only
Correct option is A. 2 protons and 2 neutrons only
$$\alpha $$ - particle is nucleus of Helium which has two protons and two neutrons.
Hence option A is correct answer.