Condensation releases latent heat as steam molecules slow and bond.

Steps:

• Steam at 110°C contacts surface at 100°C, initiating condensation to water at 100°C.
• Phase change from gas to liquid requires molecules to lose kinetic energy and form intermolecular bonds.
• Molecules slow down due to reduced average speed in liquid phase compared to gas.
• Energy is released as latent heat to surroundings, cooling steam while heating surface.

Why B is correct:

• During condensation, molecules emit latent heat (defined as energy released when gas turns to liquid at constant temperature) while slowing as they transition to ordered liquid state.

Why the others are wrong:

• A: Molecules emit energy during condensation, not absorb it.
• C: Molecules slow down in liquid phase, do not maintain gas-phase speed.
• D: Molecules slow down and emit energy, not stay same speed or absorb.

Final answer: B