Explanation:

- Option 1: Check Yourself

- Not the theme of World AIDS Day 2018.

- Generally encourages individuals to be aware of their risk factors and engage in preventive measures.

- Option 2: Save Yourself

- Not the theme of World AIDS Day 2018.

- Reflects a focus on personal responsibility for health and safety, particularly regarding infection prevention.

- Option 3: Know your Status

- Correct Answer

- The theme for World AIDS Day 2018, emphasizing the importance of people knowing their HIV status.

- Aimed to promote HIV testing and encourage those living with HIV to access services for a healthier life.

- Option 4: We Shall Overcome

- Not the theme of World AIDS Day 2018.

- Expresses hope and determination in overcoming challenges, often used in various contexts of advocacy.

The correct answer is highlighted to ensure clear understanding of the theme chosen for that year.