Answer:

Explanation:
From the question we are told that:
Initial Distance 
Initial Electric field strength 
Final Distance 
Generally the equation for Electric field is mathematically given by.


Substituting q for 


Put your bet down on Choice 'A'. The others are just flat wrong.
One kilowatt-hour = 1000 watts = 1000 joules/second
One hour = 60 × 60 = 3600 seconds
One kWh = 3600 × 1000 joules
One kWh = 36 × 100000 joules
One kWh = 3.6 × 10 × 100000 joules
One kWh = 3.6 × 10⁶ joules
Answer: Second option