On average, each one feels no net force from the ones all around. There will be fluctuations in the force on each one as they jiggle around, and in a liquid the molecules will slowly wander about. Two layers of differently coloured water will gradually diffuse into each other. Even in a solid, there can be very slow diffusion. The answer is already implied in the statements given.
Every molecule is on average in a sate of lowest available energy, with no net force on it.
If a molecule experienced a net force it would move until it didn't. Molecules in the body of a liquid are surrounded by neighbours . You might imagine that there could be around twelve packed around it - six in a ring, with three above and three below. Any molecule is, on average, in equilibrium with all of these. But a molecule at the edge has fewer neighbours, perhaps by about three.