Answer:
C: To convince you something is true
Step-by-step explanation:
When you summarize an event, it is briefly informing of an event. This elimates A as an option.
When explaining how to do something, the purpose is to inform how to execute this activity. This elimates B as an option.
When describing a place, the intention is to inform you of the location. This elimates D as an option.
When convincing an individual that an event is true, the purpose is to change an individual's mind. This is usually not directly informing an individual. Due to this, C is the least likely to inform you.