|A) Similar charges of electricity rush towards each other and then get repelled||B) clouds strike against impurities in air and the friction burns up these impurities|
|C) strong opposite charges in different clouds break down the resistance offered by the intervening air||D) water vapour produces electricity in the clouds|
Answer: C) strong opposite charges in different clouds break down the resistance offered by the intervening air
When the resistance of the air between breaks down the current flows from the positive cloud to the negative cloud in a flash which we call lightning . The difference of potential involves is very high.