Answer:
E. abandoned, vacant factories, warehouses, and residential sites that may be contaminated from past uses.
Step-by-step explanation:
A brownfield refers to a land that was used in the past for industrial or commercial activities which is not currently being used and that can be contaminated. According to this, the answer is that a brownfield is an urban area of abandoned, vacant factories, warehouses, and residential sites that may be contaminated from past uses.