Any trace of an ancient organism that has been preserved in rock is called a
a. landform.
b. continent.
c. fossil.
d. landmass.

The correct answer is fossil: for example many of the diosaur bones that we find are fossils.

The other options describe concepts much much bigger than a fossil: landform and landmass have a very similar meaning to a "continent", for example a landform can be in island or a mountain - much bigger than a fossil

c. fossil.

Explanation:

The traces of the rocks shows us the presence of the organisms that may have died naturally in the geologic history of the earth when the planet was in the developmental stage and the erosion and depositional process where very rigorous and thus got deposited in the rocks and hence got formed in the rock landmasses. Most fossils are formed in sedimentary rocks that have various layered strata and hence easier to classify them.

Iam pretty sure it is c. 2000 bce