Its a difficult question to answer.
With B Laws, the obvious career destination is lawyer, however given the large number of students doing law degrees nowadays it is increasingly being thought of as a generalist degree much in the same way as B Arts, B Science etc and students pursue any number of career paths eg. journalism and management.
Similarly, B commerce/business is a broad degree and you can usually major in an area you want to perue eg accounting, finance, HR etc.
As laws affect all aspects of business there are of course areas that combine knowledge of business and knowledge of law eg. tax professionals, auditors, investment banking etc.