Aging slowing is mostly central, not sensory or motor

Correct: B — Reflects slowing primarily in central decision and response-selection stages, with relatively spared sensory and motor stages

Bashore, Ridderinkhof & van der Molen (1997) reviewed RT-decomposition studies — additive-factors logic, ERP latencies, and the locus-of-slack technique — and argued against a uniform 'general slowing' view of cognitive aging. Sensory encoding (e.g., P1, N1 latencies) and motor execution show only modest age effects, while response-selection and decision processes (e.g., P3 latency, choice-RT lengthening) show much larger ones. The pattern points to age-related slowing concentrated in central, controlled processing — important for designing interventions that target the bottleneck rather than peripheral function.