- The explorers carefully followed the trail in the forest.
- In the forest followed the explorers carefully the trail.
- In the forest the explorers carefully followed the trail.
- The explorers followed carefully the trail in the forest.
The correct sentence structure in English is Place-Subject-Adverb-Verb-Object. The place (in the forest) should come first, followed by the subject (the explorers), the adverb (carefully), the verb (followed), and finally, the object (the trail). The correct option (a) follows this structure.
