An excerpt from the daily weather report is given below. It covers the rate of snowfall over a 9-hour period during a snowstorm:
The snowstorm lasted a total of 9 hours. It snowed at a rate of 1 inch per hour during the first 2 hours. The snow continued for the next 6 hours falling at a rate of 2 inches per hour, and finally reduced to 1 inch per hour for the last hour, after which it completely stopped snowing. Which graph shows the snowfall over the 9-hour period?

Question

An excerpt from the daily weather report is given below. It covers the rate of snowfall over a 9-hour period during a snowstorm:
The snowstorm lasted a total of 9 hours. It snowed at a rate of 1 inch per hour during the first 2 hours. The snow continued for the next 6 hours falling at a rate of 2 inches per hour, and finally reduced to 1 inch per hour for the last hour, after which it completely stopped snowing. Which graph shows the snowfall over the 9-hour period?