You would talk about law reform with changing values in society, i.e. does the law reflect the current morals, values and ethics in society? If not, was there law reform? Was this law reform effective? Did it match the current values etc in society? Just talk about that and integrate key words from question. It is directly related to the themes..
The themes cover what is in the whole syllabus for the option, so, if you do an essay on each basically you can answer every question. But you would obvi need to manipulate your essays to fit question.