Concept:Lightning is caused by the discharge of electric charges within a cloud or between a cloud and the ground.
Explanation:During a thunderstorm, the lower part of the cloud becomes negatively charged, while the upper part becomes positively charged.
The separation of charges creates a strong electric field.
When the field becomes strong enough, it ionises the air and allows a sudden flow of charges.
This discharge is called lightning and can occur within the cloud (intra‑cloud), between clouds, or between the cloud and the ground.
Thus, lightning is due to the flow of charges between different parts of the cloud or between the cloud and the ground.
Answer:The flow of charges between different parts of the cloud (Option A).