Bella frequently exhibits her own rare coin and antique collection to promote her business. Bella employs Alice to organize and exhibit this collection and is overjoyed by her performance. After two years, Alice receives a job offer from the National Gallery. Bella does not want her to leave and tells Alice that if she stays to work for her she will "give her some of the pieces in her collection". Alice agrees. Six months later, Bella refuses to hand over any pieces to Alice. Can Alice enforce the agreement against Bella? Give reasons for you answer