Why Is There Very Little Physical Evidence of Life from Rocks

Why is there very little physical evidence of life from rocks of the Archaean eon?

A) Those rocks have been deeply buried in most parts of the world.
B) Those rocks occupy inaccessible areas of mountainous regions.
C) Those rocks have been greatly eroded in most parts of the world.
D) Those rocks occupy the polar regions and are thus covered by glaciers.
E) Those rocks have been deposited in oceanic trenches deep in the oceans.