Answer: The correct answer is - Meta-communicate that she was teasing.
Explanation: Meta-communication is a type of communication that indicates how certain information should be interpreted.
A message followed by certain meta-communication can indicate differences in the real information that said the message is conveying.
Meta-communication includes nonverbal communication, changes in entonation, gestures, etc.
For instance, The following conversation between Laura and Claudia is an example of Meta-communication:
"Claudia: Hi Laura, how are you?
-Laura: Great sweetheart.
Claudia: I'm glad, could you do me a favor?
-Laura: Sure, go ahead.
Claudia: Can you please honestly tell me how do I look with this dress"
Laura answers: Honestly, I think I want to vomit. But then immediately proceeds to stick her tongue out and open her eyes.
The nonverbal communication at the end lets Claudia understand that Laura's message was a joke.