0.12 mL of a saline suspension of red blood cells labeled with Fe-59 is injected into the tail vein of a mouse. Before injection the gamma rays were counted for this 0.12 mL solution and the count rate was found to be 1.2 x 10 cpm. After a sufficient time for the blood to be thoroughly mixed, 0.12 mL of blood is removed and counted. the sample is found to have a count rate of 564 cpm. what is the approximate blood volume in mL in the mouse? 

3.4 ml. 

2.6 ml 

0.12 ml 

0.3.0 ml.