The main cause of the Hati earthquake was at a fault that runs through Hati and is along the boundary between the Caribbean and North American plates.
With everything else as constant (the planet's gravity, itself), then yes, this is true. But, if the planet's gravity still exists, then the Sun's gravitational force doesn't matter as much because of the astronomical distance between the two bodies.
The answer is either B or D. Letter A doesn't make sense and letter C isn't right either because you need rainfall to have fertile plains.