A Pole Stands in a River, Half in and Half

Multiple Choice

A pole stands in a river, half in and half out of the water.Another pole of the same length stands vertically on the shore at a place where the ground is level.The shadow cast by the pole in the river on the river bottom is:

A) slightly longer than the shadow of the pole on land
B) much longer than the shadow of the pole on land
C) shorter than the shadow of the pole on land
D) shorter than the shadow of the pole on land if the sun is high and longer if the sun is low
E) the same length as the shadow of the pole on land