A good synonym for endeavor is "attempt".
The correct answer is C. Fame is attractive, but it can hurt and does not last.
Bees are attractive in that they produce honey and are generally quite important in the ecosystems of the world. However, they can sting people which of course makes it hurt, and once they do that, they die, meaning their lives are very short. This is similar to fame - in the beginning, everything is wonderful, but then famous people tend to hurt others and get hurt themselves, and their fame is ultimately fleeting.
Answer: The right answer is the A) Compound-complex.
Explanation: Just to elaborate a little on the answer, it can be added that this is an example of a compound-complex sentence because it combines both. On the one hand, it is a compound sentence, since it is made up of two independent clauses joined by a coordinating conjunction and a comma: "Employee turnover has decreased significantly this quarter,<em> </em><em>so [...], </em>"you'll have to admit that his results are impressive." On the other hand, it is a complex sentence, since it combines a dependent clause ("even though you may question Sam's training methods") with an independent clause ("you'll have to admit that his results are impressive").
