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A. She's a bit scared.
B. She's a little scared.
C. She's a little bit scared.

1. Which of the sentences above are natural?
2. Do all mean the same? Any difference?
3. If no difference, can they be used interchangeably?

Please advise. Thanks.
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1. Which of the sentences above are natural?-- All of them.

2. Do all mean the same?-- Yes. Any difference?-- No.

3. If no difference, can they be used interchangeably?-- Yes.
Comments  
Thank you very much for your quick response. It was really helpful.