- Slowly, the cat, on the wall, climbed.
- The cat on the wall climbed slowly.
- On the wall the cat climbed slowly.
- Climbed the cat on the wall slowly.
The correct sentence structure in English is Subject-Place-Verb-Adverb. The subject (the cat) should be followed by the place (on the wall), the verb (climbed), and finally, the adverb (slowly). The correct option (b) follows this structure.