B,C,D are correct. when alkali metals are dissolved in solvent they really released electron. when Na metal is dissolved in liquid NH3 then solution becomes blue in colour and readily releases e- . Na(s) +(x+y)NH3(l) = Na(NH3)x+(aq)+ e-(NH3)y(aq) blue
Electrons are highly reducing agent in nature due to their small and high energy. Electrons are paramagnetic and conduct electricity.