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A dance programme is scheduled 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 students and parents should come in time for the programme. The instruction you think that is appropriate for this is

1. Students should come at $9.00$ a.m. and parents should come at $10.00$ a.m.
2. 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.
3. 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.
4. 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.

1. Students should come at $9.00$ a.m. and parents should come at $10.00$ a.m. - Not correct as only participating are asked to come at $9.00$ a.m.
2. 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. - This is correct
3. 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. - Not correct as it is not told that non participating students should not bring their parents.
4. 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. - Not correct as participating students need to come by $9.00$ a.m. accompanied by their parents; there is no need for them to reach earlier than their parents.

by
It will be B.

WHY D IS WRONG?
D is not the appropriate instruction as it states that the participating students have to come before 9.00 a.m. whereas they have to come at 9.00 a.m.