The answer is c
Explanation:
It is based on their state like population, literacy and poverty it varies from state to state, country to country
The energy stored in a capacitor is given by:

where
U is the energy
C is the capacitance
V is the potential difference
The capacitor in this problem has capacitance

So if we re-arrange the previous equation, we can calculate the potential V that should be applied to the capacitor to store U=1.0 J of energy on it:
Cover your cough
Wash your hands
Keep a clean space
Avoid smoking
Stay active
Hope this helps :)