Answer:
Im pretty sure it's b lol
Practical escalators use electric fields to speed up and increase the energy of a beam of particles, which are steered unfocused by magnetic fields.
Stalin completely reorganized the Soviet military, placing himself directly in charge of several military organizations. This gave him complete control of his country's entire war effort; more control than any other leader in World War II.
The answer is true that the leaders paid for the construction.