Answer:
The correct answer is letter "B": It formalizes the logistics agreed upon by the roommates in the case of a dispute.
Explanation:
Roommate relationships might not always be harmonious. In most cases, people have roommates with the only purpose of sharing rent expenses. Aside from that, they are unlikely to have another bond. Thus, some conflicts could arise as a result of dealing with strangers.
To avoid major inconveniences, a roommate agreement should be signed among the individuals sharing the apartment so in the document, they formally establish the responsibilities and limits they have by sharing the same department and, in front of problems, the document will make it easier to determine who could be at fault.