A running cheetah begins to slow down. For each meter the cheetah travels, its speed changes by −3.4−3.4 kilometers per hour. The cheetah travels a total of 21.5 meters. What is the total change in the cheetah's speed during this time?
A73.1
B71.9
C18.1
D-18.1
E-71.9
F. -73.1
A73.1
B71.9
C18.1
D-18.1
E-71.9