Final answer:
In a male patient, if the hematocrit level has decreased to 40%, it indicates adequate fluid resuscitation with a plasma percentage of approximately 60%.
Step-by-step explanation:
The correct answer is c) 40%. In a normal hematocrit value range for males, which is 42-52%, a decrease to 40% would indicate adequate fluid resuscitation. Hematocrit represents the percentage of red blood cells in the blood sample, so a decrease in hematocrit signifies an increase in plasma volume. In this case, a decrease to 40% would suggest that the client's blood plasma percentage has increased to approximately 60%, which falls within the normal range of plasma percentage for males.