Statement (A): Metals are electropositive in nature. 

Statement (B): With increase in atomic size, electro positivity increases. 

Statement (C): As the shielding effect increases, EP decreases.

Statement-C : is incorrect .The correct statement is As the shielding effect increases, EP  increases due to the increases in the shielding effect the valence electrons have less nuclear attraction and thus electron can be easily removed. Therefore greater the shielding effect, greater will be the EP. Statement I and II are correct.