Historically, Why Was a Landlord Not Responsible for Ensuring That

Historically, why was a landlord not responsible for ensuring that leased premises were tenantable?

A) Because judges favored lessors.
B) Because the standard of living was lower.
C) Because land was viewed as the more important element being leased.
D) Because it was believed that the free economy should take care of such matters.
E) Because of the large need for premises to lease.