Answer
a.) km
b.) cm
c.) km
Work Step by Step
a. m km
Among m and km, km is longer because km is 1000 m.
b. mm, cm
Among mm and cm, cm is longer because cm is 1/(100 ) m. but mm is 1/1000 m.
c. km, mm
Among km and mm, km is longer because km is 1000 m but mm is 1/1000 m