Reducing a carbon footprint in field service is primarily achieved by reducing the fuel consumption and distance driven by the fleet.

Option B is correct. The Minimize Travel Service Objective calculates the travel distance/time for each potential appointment slot. By giving this objective the highest weight in the Scheduling Policy, the optimization engine will aggressively prioritize schedules that have the shortest routes, even if it means sacrificing other metrics (like "ASAP" or "Preferred Resource"). Shorter routes directly equate to less driving and lower emissions.

Option A (Remove ASAP) might help slightly by removing the urgency to book "now" (which can cause inefficient routing), but it doesn't proactively optimize for low mileage like Option B does.

Option C (Maximum Travel Work Rule) is a hard limit (e.g., "Don't travel more than 50 miles"). While it prevents extreme outliers, it doesn't optimize the routes within that radius.