In Terms of Dating of Specific Rocks, Structures, or Landscapes

In terms of dating of specific rocks, structures, or landscapes, numerical age refers to

A) the age of geological features based on isotopic dating techniques.
B) the approximate age of geological features based on the period or epoch in which they occurred. For instance, noting a feature is from the Cretaceous.
C) a range of numeric values in which a features was likely formed and based on several lines of evidence, such as paleoclimatic and paleobotanical reconstructions.
D) the age of one feature with respect to another within a sequence of events and deduced from the positions of rock strata above and below one another.