3. A balloon is released from the top of a building. The graph shows the height of the balloon over time. What does the slope and y-intercept reveal about the situation?

A. The balloon starts at a height of 500 ft and rises at a rate of 300 ft.

B. The balloon starts at a height of 500 ft and rises at a rate of 150 ft.

C. The balloon starts at a height of 0.05 ft and rises at a rate of 150 ft.