Answer:
The original records (Option C) is the only option that gives evidence that the event has occurred. Lets assume you own a car, now how will you prove that you own the car. Of course you will show the ownership papers to tell relevant authority that you own this car. Likewise in the company, their is huge flow of data. The events occurring are recorded in the accounting system but their evidences are kept in the file. According to the International Standard on Auditing ISA 500, the evidence is must be reliable. This means the original records are always reliable because they are confirmations from the parties that are independent of the company's operations.