- Loudly, sang, the choir, the beautiful song.
- The choir sang the beautiful song loudly.
- The beautiful song sang the choir loudly.
- Loudly sang the choir the beautiful song.
The correct sentence structure in English is Subject-Verb-Object-Adverb. The subject (the choir) should be followed by the verb (sang), the object (the beautiful song), and finally, the adverb (loudly). The correct option (b) follows this structure.