- Next month, the students, the competition, will enter.
- The competition will enter the students next month.
- The students will enter the competition next month.
- Next month will enter the students the competition.
The correct sentence structure in English is Time-Subject-Verb-Object. The time (next month) should come first, followed by the subject (the students), the verb (will enter), and finally, the object (the competition). The correct option (c) follows this structure.