Before reaching a final decision on which modules to take, you should consult your personal tutor. It is a good idea to plan ahead, because the choice of options in each year affects what modules are available to you later. In particular, an optional module in one year may contain material that is a prerequisite for a module in later years. There does not have to be any very close relation between your choice of options and your planned career after your degree, but if you're interested, then by all means. Nigel Thomas from the University Careers Advisory Service has the following advice on this issue.
Universities tend to be concerned with education rather than training.
Employers know this, and are usually happy to accept that whereas a joint degree, or a wide range of options, gives you different and flexible ways of looking at problems, a single subject, or all mathematics options, gives you additional rigour of approach. Either way, they value your experience at university as good general education, so, as a rule, you need not let career considerations sway you in deciding options. Otherwise choose something you are confident you will enjoy. If you are curious about some of the implications of taking particular options, then you might consider the following points, and discuss them with your tutor and the Careers Advisory Service. The majority of organisations that recruit graduates on a regular basis offer thorough training irrespective of the degree discipline, so that taking a Business Studies option does not automatically provide any advantage.