In a direct current, the electric charge, or current, only flows in one direction. In an alternating current, the electric charge changes periodically.
Generally, rings form from moons, asteroids, or comets that have disintegrated due to a collision or because they got too close to their planet (Roche Limit). ... Most of the debris, however, will not have enough energy to overcome the planet's gravity and will remain in orbit around the planet.
I think its all four of them could be wrong but try all four !!!!!!
42- C
43- A
44- C
45- A
46- B
47- D
