Probably C. Upsetting. Although I'm not sure if option D is cut off?
All of the above are common linking expressions. But if you must chose one pick and, or but.
The first one Respectful would been believe in quality and worth of others and yourself.
Answer: Skiing Vs. Snowboarding for Beginners. “Skiing is easier to learn but harder to master - where as snowboarding is harder to learn but easier to master.” ... With skiing, a beginner's technique can be broken down into a modular approach but its perfection will require you to become extremely technical.
Explanation: