Three friends are having a discussion about taxes, but the conversation is soon sidetracked as different statements bring up related ideas. The conversation drifts from taxes, to politicians, to the election, to fund-raising. This shift in the focus of the conversation is consistent with Collins and Loftus' theory of:

A. prospective memory processes.
B. spreading activation within a semantic network.
C. schema-based recall of information.
D. mood-congruent memory.