The Complete Blood Count Report of a Client, the Enlarged

The complete blood count report of a client, the enlarged lymph nodes, and epistaxis indicate that the client has developed acute lymphocytis leukemia. What could be the reason for the occurrence of epistaxis in the client?

A) Crowding of platelets by blast cells
B) Invasion of blast cells into the central nervous system
C) Proliferation of blast cells in the center of the bones
D) None of the above