What is the top-ranked South Asian Country in SDG achievements in 2021 a. Maldives b. Sri Lanka c. Bhutan d. India

To answer this question, we need to refer to the latest Sustainable Development Report (SDR) which provides the SDG Index ranking for all countries. The SDG Index ranks countries based on their performance on the United Nations' Sustainable Development Goals (SDGs).

As of 2021, the latest report available is the Sustainable Development Report 2020. According to this report, the top-ranked South Asian country in SDG achievements is:

a. Maldives b. Sri Lanka c. Bhutan d. India

Unfortunately, I am an AI and do not have real-time data access to provide the most current ranking for 2021. I recommend checking the latest Sustainable Development Report for the most accurate and up-to-date information.