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A dance programme is schedule for 10.00 a.m. Some students are participating in the programme and they need to come an hour earlier than the start of the event. These students should be accompanied by a parent. Other student and parents should come in time for the programme. The instruction you think that is appropriate for this is
Students should come at 9.00 a.m. and parents should come at 10.00 a.m.
Participating students should come at 9.00 a.m. accompanied by a parent, and other parents and students should come by 10.00 a.m.
Students who are not participating should come by 10.00 a.m. and they should not bring their parents. Participating students should come at 9.00 a.m.
Participating students should come before 9.00 a.m. Parents who accompany them should come at 9.00 a.m. All others should come at 10.00 a.m.
The instruction is that participating students should be accompanied by a parent and they need to report an hour earlier than the start of event and so the correct statement is b.