Emma's Lease Deed Stated That She Had to Pay a Rent

Emma's lease deed stated that she had to pay a rent of $1,000 per month, taxes of $1,500 per quarter, and specified that she refrain from playing loud music in the apartment. For business purposes Emma had to leave the city. Hence, she transferred all her interests in the lease along with the obligations to her younger sister, Emily. Emily forgot to pay the taxes during the beginning of the next quarter. Which form of transfer did Emma choose and who would be liable to the landlord for the default in the payment of taxes?

A) Assignment; Emma
B) Sublease; Emma
C) Sublease; Emily
D) Open listing; Emily
E) Tenancy at will; Emily