The cross sections below represent three geologic columns, I, II, and III, exposed at three different
locations. The rock layers have not been overturned. Letters A through E represent different fossils.
Which rock layer is the youngest?
(1) green shale containing fossil B in column I
(2) glacial soil containing fossil E in column III
(3) brown sandstone containing fossil C in column II
(4) gray limestone containing fossil D in column I
