$11$ Read the scenario and determine what needs to take place based on the resolutions described in the text.

Penn contracts with Lisa to do a landscape architecture project on Lisa's property. Before the contract starts, a local city ordinance is instituted which severely limits citizens' ability to plant certain types and numbers of plants in order to conserve water. Penn and Lisa now need to institute a$($n$)$

Force majeure renovation

Novation

Accord and satisfaction

Substitution