The expression 'roads improved military mobility' reflects which of the following?

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Improved roads boost military mobility by letting armies move faster, carry supplies, and respond to threats across large areas. Quick, reliable transport of troops, equipment, and provisions is crucial for campaigns, enabling rapid reinforcement, maneuvering, and sustained operations. Historically, rulers invested in road networks to project power and keep frontiers secure, showing how infrastructure underpins military capability. The other options focus on different kinds of movement—sanitation deals with public health, naval expansion with ships and sea power, and pilgrimage routes with civilian religious travel. So this expression specifically highlights how road networks enhance the movement and effectiveness of military forces.