It should be a. Once fossil fuels are used we can not use them anymore.
The state of the object on which the net force is zero is 'constant uniform motion',
or 'unaccelerated motion'.
Hello!
The garbage patchs are a site with high concentrations of trash. They are formed by the ocean gyre, where the ocean have convergences zones forming a circle of currents. When the garbage join the circle, it can't go out, cause the currents make a kind of a permanent "wall".
We can locate garbages patchs in the South Atlantic Gyre, Indian Ocean Gyre and the South Pacific Gyre.
Hugs!