The best answer is A because the question asks for a typical cost-saving estimate, not an extreme or best-case savings claim. In reliability engineering, proactive work reduces avoidable costs by preventing emergency labor, expedited parts, unplanned downtime, rework, collateral damage, and production disruption. However, a proactive approach does not normally remove nearly the entire project cost. A savings range of US $25,000 to US $50,000 on a US $100,000 reactive project reflects a realistic 25% to 50% cost-avoidance band. Option B may be possible in some favorable cases but is less typical. Option C is too aggressive for a general estimate because it implies that most of the project cost disappears simply by being proactive. Reactive maintenance is performed after failure and is often associated with urgent, disruptive, and expensive response work, while proactive and preventive approaches reduce the probability and impact of those failures. This aligns with the CRL emphasis on moving from reactive firefighting to proactive reliability strategy.