Answer: Nonconforming Use
Explanation:
Nonconforming Use is the usage of property that was earlier permitted to be used according to zoning law establishment but later property was no longer permitted to be used due to the alteration occurred in zoning ordinance .According to this law , property no longer fits under the regulation to be used.
According to the question, Lois kept running grocery store till the zoning regulation got changed, under which packaged food sale is not permitted anymore in that area.Thus, it is an example of nonconforming use.