If a Geologist Wished to Date an Outcrop of Sandstone

If a geologist wished to date an outcrop of sandstone beds that he or she found,which of the following should they look for to yield a specific date?

A) a fossil known to have a wide geographic distribution and to have existed over a long range of time
B) a sedimentary layer constrained by igneous or metamorphic rocks
C) a fossil known to have a small geographic distribution and to have existed over a short range of time
D) a sedimentary layer cut across by a fault