A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5 millicuries/mL. If the patient undergoing the test needs a dose of 10 millicuries, how much of the solution should be injected into the patient?
A) 2.2 mL
B) 3.5 mL
C) 4.5 mL
D) 6.7 mL