In addition to the environment, renewable resources—such as solar power and hydroelectricity—may also provide an economic benefit,

a. as it reduces our dependence on foreign oil.
b. as they may reduce our dependence on foreign oil.
c. this being the reduction in our dependence on foreign oil.
d. as they depend on the reduction of foreign oil.

Option A

Explanation:

Renewable resources of energy are clean source of energy. They are sustainable as they are readily available, can be used again and again and do not produce any pollution neither during production stage nor during usage stage by an individual.  

There are very nations in the world which are oil rich and country itself has no oil reserve. In such scenarios, the dependency of nation on other countries increases. But in lieu to in-house renewable energy resources, country will not import oil from other nations  

Hence, option A is correct.  

thinking it would be d not too sure but i think it's right

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.