I think the theme is the cruelty and sometimes the inmorality of racist acts and activism .Growing up in this Apartheid era affected the author in such a way that she used The light of Ghandi´s lamp to express how unfair this world was with black people and continues to be. Being equal, having equal rights or seeking to have them should not be a reason to be put in jail.The girl´s sister is arrested because she is part of an anti- apartheid group and she participated in protests. At first she thinks it is wrong to have the intention to overthrow a government but then understands , with her sister in prison, that the only thing people are fighting for is equal rights.
Answer: I think that it means don't be a follower be a leader, because sometimes you have friends that are very fake to you and what I mean by that is that they will pressure you into doing things you really don't want to do but you don't want to make a fool of yourself and loose your "friends"by backing out.And or it might mean that when you're friends are basically pushing you to do things that you don't want to do and know you don't want to do it but you're the type that can't say no.It means that when they are making you do those things and you really don't want to do it you end up saying a firm no.and then you leave it at that and you might even end up unfriending them because you know that they are causing you harm, so you're showing strength and character by doing that because you are showing them a side they have never seen and your telling them that you are basically stronger than you look or feel or that you have a strong personality.
I hope this is correct I'm sorry if it is not, I tried my best
a and b........................