Explanation:

- Option 1: "flown away" is incorrect. "Flown" is the past participle form, used with "have/has," as in "have flown."

- Option 2: "flew away" is the correct choice. "Flew" is the simple past tense of "fly," which is appropriate here after "As soon as," suggesting a completed action.

- Option 3: "fly away" is incorrect. This is the base form, used for present tense or infinitive constructions.

- Option 4: "flies away" is incorrect. This is the simple present tense form, which doesn’t match the past sequence indicated by "As soon as."

- Correct Answer: Option 2 - "flew away."