“a point representing the mean position of the matter in a body or system.”
Imma guess A! Idk if it’s 100% correct tho so I’d check that!
Answer:

<em>The potential environmental impacts associated with solar power—land use and habitat loss, water use, and the use of hazardous materials in manufacturing—can vary greatly depending on the technology, which includes two broad categories: photovoltaic (PV) solar cells or concentrating solar thermal plants (CSP).</em>
Explanation:
I just answer the second question
Maybe The 3rd One Not Sure!