If an average-weight adult male patient with a 7 gram/dL hemoglobin is given two units of packed cells, what would be the approximate new hemoglobin value (assuming there is no active bleeding or other predisposing factors that would shorten the survival of the blood cells?
A) 8 gram/dL
B) 9 gram/dL
C) 10 gram/dL
D) 11 gram/dL