The pressure P (in pounds per square foot) , in a pipe varies over time. Two times an hour, the pressure oscillates from a low of 100 to a high of 250 and then back to a low of 100 . The pressure at ,
A) 100 pounds per square foot
B) 150 pounds per square foot
C) 200 pounds per square foot
D) 250 pounds per square foot
E) It cannot be determined from the information given.