A. This is not the best answer. It is a quantitative explanation about memory performance.
B. This is not the best answer. This also is a quantitative explanation about memory performance.
C. This is the best answer. It describes the individual as engaging in a cognitive process that is influenced by contextual opportunities and constraints.
D. This not the best answer. It describes the decline with compensation aspect of mechanistic metatheories.
E. This is not the best answer. This explanation is quantitative, describes unidirectional decline, and suggests high predictability in outcome.