- The sun brightly illuminates the sky today.
- Today illuminates the sun the sky brightly.
- The sky today illuminates the sun brightly.
- The sun illuminates the sky brightly today.
The correct sentence structure in English is Time-Subject-Adverb-Verb-Object. The time (today) should come first, followed by the subject (the sun), the adverb (brightly), the verb (illuminates), and finally, the object (the sky). The correct option (a) follows this structure.