Why is the question combining resolving incident which is a standard change with security patch which is an emergency change? Answer can be Emergency only if it is about security patches. Please correct me if I am wrong.

Resolving incidents and implementing security patches would be emergency change.

5.2.4 Emergency changes These are changes that must be implemented as soon as possible; for example, to resolve an incident or implement a security patch.

Emergency changes need to be implemented as soon as possible, perhaps in response to an issue or a security breach. They are assessed and authorised when possible, but some steps (e.g. testing) might be left out if the level of urgency justifies it.

I guess typo mistake, the question should be - What type of "Change" not Charge and the answer is C: Emergency Change

Please update question from "charge" to "change"

The keyword is incidents. This is an emergency. It's an emergency change. C

C is correct: Emergency change - A change that must be implemented as soon as possible without strictly following the standard process e.g. to resolve an incident or implement a security patch.

I don't think frequent emergency changes are likely in any healthy organization. Standard changes often resolve incidents without further approval and can include provisions of devices such as installing an app for a user, or installing a 'windows update security patch'. Standard changes include service requests. This is not verbatim in the textbook but can be inferenced.