Answer:
Assignment
Step-by-step explanation:
Since in the given situation it is mentioned that Lorenzo has received the fellowship for studying abroad for a year but he needs to stay 6 months in the apartment also at the same time the landlord gives the permission for the new agreement with his sister where his sister pay the rent to him and then he pay the rent to landlord so this represent the assignment which needs to be followed for the 6 months anyhow