Analogy — Launcher : Missiles Select the device–projectile relation that matches.

Introduction / Context:
“Launcher : Missiles” expresses a device designed to propel a specified projectile. We must find a parallel pair with a device that launches/propels its characteristic projectile.

Given Data / Assumptions:

• Launcher → launches missiles.
• Parallel should be device → its projectile/object launched.

Concept / Approach:
Discard pairs where the second term is not the projectile, where the first term is not the device, or where both are co-hyponyms (same category items) rather than device–output.

Step-by-Step Solution:

Verification / Alternative check:
History and physics examples list catapults launching stones, analogous to missile launchers launching missiles.

Why Other Options Are Wrong:

• Gun : Revolver — hyponymy, not device–projectile.
• Boat : Anchor — function is mooring, not launching.
• Engine : Train — traction, not projectile.

Common Pitfalls:
Confusing “powers/contains” relations with “launches/propels.”

Final Answer:
Catapult : Stone