Explanation:

In the past few months, hundreds of elephants have died mysteriously in Botswana’s Okavango Delta. Botswana is a landlocked country in Southern Africa. Its landscape defined by the Kalahari Desert and the Okavango Delta, which becomes a lush animal habitat during the seasonal floods. Botswana has the world’s largest elephant population, estimated to be around 130,000. Hence option 2nd is correct.