As others have already mentioned, the only way is to get the right tenant. You might have to spend more time interviewing the prospective tenant, but it's worthwhile.

You should still have a well drafted tenancy agreement in place, but going through the legal process to enforce it can be a big hassle.

My pick is either (b) or ©.

Students being students would not have high responsibility towards your property. Likely to be poor in maintaining it. Also in trying to save money, students often tend to get more students to share the place (to keep costs down). So end up having lots in your property (and with more people, more wear and tear).