Mark wanted to make some extra money, so he went door-to-door in his neighborhood asking residents if they had any small jobs that they could hire him to perform. Mark had no idea of whether anyone had work for him, so he picked the houses randomly and knocked on the doors to see if anyone was home and perhaps interested in his services. In terms of the personal selling process, Mark was engaged in
A) stimulus-response selling.
B) showrooming.
C) cold canvassing.
D) closing.
E) traffic generation.