Step 1: Recall what marks a developed country.
A developed country generally has a stronger economy, better healthcare, wider access to education, and a higher standard of living for its people compared to a developing country.
Step 2: Match each option to what we would actually expect.
A developed country would have a low infant mortality rate because of good healthcare, a high literacy rate because of good schools, and a high net attendance ratio because most children actually go to school, so the other three options describe the opposite of what a developed country looks like.
Step 3: Confirm the correct trait.
A high per capita income is exactly what we expect in a developed country, since it reflects a stronger economy and greater average wealth per person.
Step 4: State the final answer.
Hence, the correct characteristic of Deepti's country is option (B): High Per Capita Income.