A. She's reading the text Gus has sent her and is thinking of what to reply.
B. He texted her, "Hey just wanted to say :)"
C. It doesn't have a clear meaning because she mentions it as being ambiguous.
D. It is difficult to respond because she's debating whether or not to send a winky face, a smiley face, or an open laughing face.
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a. a simple smiley face
b. a winking face
c. an open-mouthed laughing face