Final answer:
Option B is the best combination as it forms a clear compound-complex sentence, presenting both a contrast and a causative relationship regarding the effects of music.
Step-by-step explanation:
The compound-complex sentence requires at least two independent clauses and one or more dependent clauses. The best way to combine the sentences is by ensuring that the sentence structure is clear and each clause is properly connected. Considering the original sentences, option B) Music relaxes some people, but other people get energy from music because it increases their heart rate. is the correct choice. It creates a compound-complex sentence that reflects both the contrast between people's reactions to music and the causal relationship for why music energizes some individuals.