Events:
A) are stored on chain and are a great way to get a return value when a contract calls another contract.
B) are stored in something like a side-chain and cannot be accessed by contracts.
C) are used primarily for debugging exceptions in solidity.

Question

Quizplus · Accepted Answer

Events in Solidity are logged on the blockchain but are not stored in a way that contracts can access them. They are mainly used for off-chain applications to listen to and react to changes.