The answer is D, they just wanted to expand westward
A. Building a network of roads.
To remedy the stability problem, Bohr<span> modified the </span>Rutherford model<span> by requiring that the electrons move in orbits of fixed size and energy. The energy of an electron depends on the size of the orbit and is lower for smaller orbits. Radiation can occur only when the electron jumps from one orbit to another.</span>
