The correct option is B Leishmania donovani
Leishmaniasis is the disease caused by protozoan parasites of the Leishmania genus. Two species of Leishmania are known to give rise to the visceral form of the disease. The species commonly found in East Africa and the Indian subcontinent is L.donovani and the species found in Europe, North Africa and Latin America is L. infantum.
Thus, the correct answer is option (A).