(c) Sri Lanka
Sri Lanka has the highest HDI among the given countries, as it holds HDI Rank 73 (2018), which is the best (lowest rank number) in the table.
In HDI ranking, a lower rank number = higher/better development. Sri Lanka ranks 73rd in the world, far ahead of India (130), Bangladesh (134), and Nepal (143). So always read HDI rank as: smaller number = better HDI.