A 5-year-old child presents with a history of fever off–and–on for past 2 weeks and petechial spots all over the body and increasing pallor for past 1 month. Examination reveals splenomegaly of 2 ems below the costal margin. The most likely diagnosis is –
Acute leukemia Idiopathic thrombocytopenic purpura Hypersplenism Aplastic anemia