This is a compound sentence because it is two independent cluases joined by a conjunction (after). A complex sentence would be one independent clause and one dependent clause joined with a conjunction and a simple sentence is just a sentence with one independent clause.
The correct answer is B.
The first two sentences are establishing characteristic shared by both petroleum and coal. The word "however" is used to contrast the similarities already presented with the differences that will be stated in the following sentences.
<span>William James suggested that, "to be cheerful, . . . act as if cheerfulness were already there." William James was a philosopher and psychologist and his theory was that if a person acted as though they were already happy, they would attract more happiness.</span>
The answer is B because it just is so deal with it
