Answer:
All of the choices are correct.
Step-by-step explanation:
Older siblings have the choice in which example they are going to set for their younger siblings. The most preferable way an older sibling may help their younger siblings would be to be a positive role model and set a good example by getting good grades, helping them out, and always being there for them. Although this is the best way for an older sibling to be/act they may choose to be a bad influence and set a bad example by being mean, lazy, and disrespectful. An older sibling can be any of these things. It is up to them to figure out what they are going to do though.
I hope this helps! :D