Jacqueline practiced drums four times last week for sessions of 40 minutes, 35 minutes, 45 minutes, and 30 minutes. Cassie practiced five times last week for sessions of 15 minutes, 30 minutes, 15 minutes, 15 minutes, and 50 minutes. Which statement is true based on the data above?

a
The greatest amount of time either girl spent practicing was one of Jacqueline’s practice sessions.
b
The average length of time Cassie spent practicing is greater than the average length of time Jacqueline spent practicing.
c
The difference in length between Cassie’s longest and shortest practice sessions was greater than the difference in length between Jacqueline’s longest and shortest sessions.
d
The two girls practiced for the same total amount of time last week.