Bone marrow failure ddx

In a patient with pancytopenia and a low reticulocyte count, which bone marrow biopsy finding is most consistent with a diagnosis of aplastic anemia?

1: Hypercellularity with increased blasts
2: Hypocellularity with fatty infiltration
3: Excess fibrosis with abnormal megakaryocytes
4: Replacement of marrow with malignant cells