Explanation:

- She surprises me.

- Current tense. She is actively surprising you.

- I am surprised by her.

- Current feeling. You are now surprised because of her actions.

- Correct Answer: This matches the meaning of being presently surprised.

- I was surprised by her.

- Past tense. You were surprised by something she did in the past.

- I am surprised at her.

- Suggests surprise at her actions or demeanor, but can imply critiquing or judging.

- I surprised her.

- Role reversed. You are the one surprising her.