A 5 year old child presents with 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 cms below costal margin.The most likely diagnosis is:

• A. Hypersplenism
• B. Aplastic anemia
• C. Acute leukemia
• D. Idiopathic thrombocytopenic purpura