An AI solution is implemented to detect what the user wants to do. The user mentions that he wants to buy a ski jacket for an upcoming vacation in Colorado.
How can the entities be derived from the conversation using IBM Watson services?

A. Upload training data to the Discovery service and use the Discovery API to query the results
B. Use the Tone Analyzer service to retrieve the level of openness in the utterance

C. Pass the utterance from the user to the Natural Language Understanding service Entities API

D. Pass the utterance from the user through Speech to Text then apply Tradeoff Analytics