Explanation:

- Option 1: Odisha - Odisha, a state on the eastern coast of India, has implemented various health initiatives but was not the state to launch the SAANS campaign in February 2021.

- Option 2: Uttar Pradesh - As the most populous state in India, Uttar Pradesh has several health campaigns but was not associated with the launch of the SAANS campaign in February 2021.

- Option 3: Sikkim - Known for its clean environment and healthcare initiatives, Sikkim was not the state that launched the SAANS campaign in February 2021.

- Option 4: Madhya Pradesh - Correct Answer - Madhya Pradesh launched the SAANS campaign in February 2021 to reduce child mortality due to pneumonia by increasing awareness and improving healthcare services.

The SAANS campaign aims to mobilize healthcare workers and communities to combat pneumonia, focusing on preventive and clinical measures to safeguard children's health.