What happens to a reaction at equilibrium when a reactant is removed from the reaction system

When a reactant is removed based on a reaction at equilibrium, the condition favors the backward reaction. This obeys the Le Chatelier's principle which states that any disturbance in the system shall be dealt in a way that the system counters that disturbance.

I’m really not sure what’s the answer. sorry

Answer///an early form of the atomic theory; dalton atomic theory;