The prefix of meditate is premeditate
Answer: involved in an activity for its own sake. The ego falls away. or the mental state in which a person performing some activity is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity. Wikipedia
Explanation: According to positive psychologist Mihály Csíkszentmihályi, what you are experiencing at that moment is known as flow, a state of complete immersion in an activity. He describes the mental state of flow as "being completely involved in an activity for its own sake. The ego falls away.
The sentence given is "A major Romantic poet, John Keats wrote brilliantly, loved hopelessly, and died prematurely. The answer is letter C. "and died prematurely". This is to maintain the parallel structure of the sentence which should be your guide in choosing the next phrase. "brilliantly", "hopelessly", and "prematurely" are alike.
I'm pretty sure its C. Crude means not yet processed or refined. It makes the most sense.