How to use a knife and fork: hold a fork in your left hand, hold a knife in your right hand, and don't serve your elbow. First, fork the food, then cut a small piece with a knife (the size should be easy to put in the mouth), and fork it in the mouth with your left hand. This is an English way of eating. The American way of eating is to start with a fork in your left hand and a knife in your right hand, cut a small piece of steak and other dishes, then put down the knife and eat with a fork in your right hand. Some people cut the steak into small pieces at a time, then put down the knife and switch the fork to the right hand to take the steak. Either way, when cutting food with a knife, don't cut it too much. Press the back of the knife with your index finger and press your wrist slightly hard to cut the food easily. Don't saw it back and forth like a saw. So the answer is D.