Explanation:

- Option 1: Prajakta Koli

- She is a popular Indian YouTuber and content creator known as "MostlySane."

- Correct Answer: Prajakta Koli became UNDP India's First Youth Climate Champion.

- Recognized for her efforts in climate change advocacy and spreading awareness among the youth.

- Option 2: Ananya Pandey

- Bollywood actress known for her roles in several Hindi films.

- Engaged in various social initiatives but not specifically known for climate change work.

- Option 3: Amit Bhadana

- An Indian YouTuber and comedian.

- Primarily focuses on comedic skits and entertainment content.

- Option 4: Bhuvan Bam

- A famous Indian comedian and YouTuber known for his channel "BB Ki Vines."

- Creates satire and entertainment content, focuses less on climate activism.