Who among the following athletes was the first ever youth ambassador of United Nations International Children's Emergency Fund (UNICEF) India?

Hima Das

The correct answer is Option (4) → Hima Das

Out of the athletes you listed, the first ever youth ambassador of UNICEF India was Hima Das.

Hima Das is a star Indian sprinter known for her achievements in track and field events like 100m, 200m, and 400m. She was appointed as UNICEF India's first Youth Ambassador in 2018 to inspire and engage young people in India for the betterment of children and adolescents.