Concept:The atomic model that places electrons in fixed paths around the nucleus is the Bohr model.
Explanation:Niels Bohr introduced this model in 1913.
It describes electrons as moving around the nucleus in specific energy levels or shells.
Each energy level corresponds to a fixed amount of energy.
Electrons can move between levels only when they absorb or release energy.
The Rutherford model only shows a central nucleus with electrons around it, without fixed levels.
The Thomson model describes electrons spread within a positive sphere.
The Dalton model treats the atom as a solid, indivisible particle.
Therefore, the model that matches the description is the Bohr model.
Answer:A. Bohr model