Answer:
From the multiple choices provided for the action of capacitor, option 
(d) stores electrical energy 
is correct
Step-by-step explanation:
A capacitor is basically a two terminal device that stores electrical energy in the electric field in its vicinity. It is apassive element.
 The property of a capacitor to store electrical energy or the effect of a capacitor is known as its capacitance. The capacitance of a capacitor is given by:
Q = CV or C = 

It is originally known as condensor and it can be said that a capacitor adds capacitance to the circuit.