Final answer:
Form 940 can be corrected by filing an amended Form 940 or a Form 940-X.
Step-by-step explanation:
The correct way to correct Form 940 is by filing an amended Form 940 or Form 940-X.
Option B, filing an amended Form 940, is the traditional way to correct errors on an already filed Form 940. This allows you to make changes to the original form and submit the corrected information.
Option C, filing a Form 940-X, is used when you discover an error after the return has been filed and accepted by the IRS. The Form 940-X is used to correct the earlier filed form and provide the corrected information.
Both options can be used to correct errors on Form 940, but the appropriate option will depend on the specific situation and timing of the discovery of the error.