The correct answer is: A. On equator.
A synchronous orbit is an orbit in which an object revolves around a planet at the same rate that the planet rotates on its axis. This means that the object appears to stay in the same position in the sky relative to the ground. Synchronous orbits are used for satellites that need to stay over a particular point on the Earth’s surface, such as weather satellites or communications satellites.
The best place to launch a satellite into a synchronous orbit is from a location on the equator. This is because the Earth’s rotation at the equator is fastest, so the satellite will have the least amount of work to do to reach its desired orbit. If a satellite is launched from a location at a higher latitude, it will have to travel further to reach the same orbit, and it will therefore require more fuel.
Options B, C, and D are incorrect because they are not locations on the equator.