Which sentence from the passage is an example of the author's bias?
a.
"these rules exist to protect the environment, the natural beauty, and the wildlife of an area."
b.
"companies can easily absorb these added costs because excavation mining creates huge profits."
c.
"regulations include fees and fines for companies who do not follow environmental guidelines."
d.
"many times, coal companies later sell this land to developers who build towns and urban centers."