Analysis:
The phrase 'turn ..... at the party' suggests arriving at the party. The correct phrasal verb to indicate arrival is 'turn up'.
Breakdown:
- A down: Incorrect. 'Turn down' means to reject or decrease volume.
- B over: Incorrect. 'Turn over' means to flip or change position.
- C up: Correct. 'Turn up' means to arrive.
Translated Question:
1 Ханна не ..... на вечеринку до 9 часов.