Ginny Sublet Her Apartment to Fred by Assigning Her Lease

Ginny sublet her apartment to Fred by assigning her lease to him. If Fred doesn't pay rent, who is liable to do so?

A) Since Fred accepted the assignment of the lease, he is responsible and the landlord must collect from him.
B) Since Ginny is the original tenant, she is liable and the landlord must collect the rent from her.
C) Ginny is responsible because it is not legal to assign a lease to another person.
D) Ginny and Fred are both liable, and the landlord may sue both parties to recover the unpaid rent.