Explanation:

- Correct Answer: Option 2: Padma Lakshmi

- In March 2019, Padma Lakshmi, an Indian-American television personality known for being the host of the cooking competition show "Top Chef," was appointed as a Goodwill Ambassador for the United Nations Development Programme (UNDP). Her role involves advocating for the alleviation of hunger and poverty, as well as supporting women's rights and development issues.

- Option 1: Aziz Ansari

- Aziz Ansari is a comedian and actor known for his show "Master of None," but there is no record of him being appointed as a UNDP Goodwill Ambassador.

- Option 3: Priyanka Chopra

- Priyanka Chopra is a well-known actress and philanthropist who has been a UNICEF Goodwill Ambassador, but not specifically for the UNDP in 2019.

- Option 4: Annet Mahendru

- Annet Mahendru is an actress known for her role in "The Americans," and she does not have a noted involvement with the UNDP as a Goodwill Ambassador.