I do not know which states but the main countries are China, India, Egypt, Greece, Rome and Britain.
To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
Answer: b to spread the religion of Islam
Explanation:
A. 30,000 units because the total energy decreases