For Which of the Following Should We Use an R-Chart

Multiple Choice

For which of the following should we use an R-chart to monitor process quality?

A) Weighing trucks at a highway inspection station to determine if they are overloaded
B) Deciding whether an airliner has sufficient fuel for its trip
C) Student grades measured from 1 to 100
D) Determining whether vehicles from a motor pool will run
E) Determining the accuracy of a forecast of "snow"