Wow.. Alexander the Great.... I remember learning about him... Any ways to answer your question your answer would be possibly D.. if i am incorrect then I am truly sorry.
Answer:
<em>Hello, Combustion occurs when fossil fuels are burned, and the elements in the fossil fuels oxidize, or combine with oxygen. When coal is burned, the carbon oxidizes to form carbon dioxide, or CO2. Hope That Helps!</em>
<em>From SusieLouielove.</em>
We can estimate the age of an open cluster of stars by examining (The turnoff point of the cluster)