Which best describes the transition from gas to liquid?

Answer 1

Energy must be removed because particles in liquid move more slowly.

Energy must be added because particles in liquid move more quickly.

Energy is neither added nor removed in this phase transition.

Energy is either removed or added, depending on the type of particles

Answer 2

Think of this equation.
liquid + energy = gas
You have the reverse of this which means energy must be removed from a gas to form the liquid.