Bottom-up active management begins with the selection of individual securities rather than starting from a benchmark, index composition, or top-down macro view. The manager’s research focuses on company-specific factors such as business model strength, management quality, earnings outlook, competitive position, valuation, and balance sheet resilience. Because the investment case is built security by security, benchmark weights are not the anchor for portfolio construction, and the manager may hold stocks that are not in the benchmark or may ignore benchmark sector allocations entirely. This is why benchmarks are not central to decision-making in a bottom-up approach: the driver is the perceived attractiveness of each stock on its own merits. Option A can be a consequence, not the reason. Bottom-up portfolios often do exhibit tracking error, but tracking error is the outcome of ignoring benchmark weights, not the rationale. Option B is not defining, since holding periods vary widely across bottom-up managers. Option D is vague and does not express the core principle tested.