In 1675,Rømer Measured the Speed of Light by

Multiple Choice

In 1675,Rømer measured the speed of light by

A) timing eclipses of Jupiter's satellites,which appeared to occur later when Earth was farther from Jupiter.
B) measuring how long it took the light from stars located at different distances to reach Earth.
C) reflecting light from a mirror rotating at a known speed and measuring the angle of deflection of the light beam.
D) opening a shutter on a lantern on a hilltop and measuring the time taken for light from an assistant's shuttered lantern to return.