Which is not a reason for the lack of a fossil record from the precambrian time? (45 points)

a.) like the rocks of the phanerozoic eon, precambrian rocks contain many visible signs of complex life forms

b.) precambrian rock has been eroded or metamorphosed over billions of years, and very little of it remains at the surface

c.) multi-celled organisms evolved in the oceans during the latest years of the precambrian time

d.) the single-celled organisms that existed during that time did not leave easily identifiable fossils