- On the mountain, last week, hiked, they.
- They hiked last week on the mountain.
- Last week hiked they on the mountain.
- On the mountain hiked they last week.
The correct sentence structure in English is Subject-Time-Place-Verb. The subject (they) should be followed by the time (last week), the place (on the mountain), and finally, the verb (hiked). The correct option (b) follows this structure.
