Explanation:

- Friction indeed depends on how smooth or rough the contacting surfaces are—rougher surfaces usually mean more friction.

- The force of friction always acts against or opposes the direction of applied force. Its main job is to resist motion.

- Option 1: reflects — Friction does not reflect applied forces. It does not "bounce back" the force.

- Option 2: conducts — Friction does not conduct forces like electricity. This is not related.

- Option 3: opposes — This is the correct answer! Friction always acts to hinder or slow down motion, working opposite to what you apply.

- Option 4: adds up to — Friction does not add to the applied force. Instead, it subtracts from the motion that the force would otherwise produce.