On the blank computer screen 18 cm high, the following picture of the cursor was observed when the mouse was moved. What was the speed of the mouse? The typical computer display works with 60 frames per second.
[Figure: Multiple cursor images showing motion trail across screen]
A. About 1 m/s
B. About 2 m/s
C. About 4 m/s
D. About 1 cm/s
E. About 2 cm/s
F. About 4 cm/s