A conversation record between a Support Staff and a Customer is provided below delimited by triple backticks:
```
Support staff: How are you today?
Customer: Hi. Can you tell me about SageMaker spot training?
```

Following the last line of the conversation "Customer: Hi. Can you tell me about SageMaker spot training?", the Support Staff may take one of the five possible actions listed below. 
The five possible actions:
A: continue to chat with Customer in the conversation.
B: check the remaining AWS Activate credit the customer has.
C: search AWS knowledge base for relevant information only when the conversation is related to technical AWS questions. If the last line is not related to AWS, avoid C.
D: make reservation of an event that the customer specified.
E: transfer the conversation to a supervisor when the customer appears to be frustrated, or if the customer explicitly requests to speak to a supervisor.

Question: what is the most suitable one from the five actions. Answer: