If Stacy can paint \(\frac{3}{4}\) of the bedroom in 3 hours, we can find out how long it would take her to paint the entire room.
First, we calculate the rate at which she paints:
\[ \text{Rate} = \frac{\frac{3}{4} \text{ of the room}}{3 \text{ hours}} = \frac{3}{4} \div 3 = \frac{3}{4} \times \frac{1}{3} = \frac{1}{4} \text{ of the room per hour} \]
Now, if she can paint \(\frac{1}{4}\) of the room in 1 hour, we find out how many hours it will take her to paint the whole room (which is 1):
\[ \text{Time to paint the entire room} = \frac{1 \text{ room}}{\frac{1}{4} \text{ room per hour}} = 4 \text{ hours} \]
So the correct answer is:
4 hours.