- Students study quietly in the library.
- In the library study quietly students.
- In the library students quietly study.
- Study in the library quietly students.
The correct sentence structure in English is Place-Adverb-Subject-Verb. The place (in the library) should come first, followed by the adverb (quietly), the subject (students), and finally, the verb (study). The correct option (a) follows this structure.
