When the management of a large grocery store heard that Walmart might be coming to town, they developed alternative courses of action they could take if their competitive landscape changed. What type of plan did they develop

Contingency aplan

Explanation:

Contingency plans, also called a "Plan B," are plans taken to prepare another working option in the event of a risk occuring so that the aim of the particular plan is still achieved ... It involves having a strategy in having buisness functions, and resources necessary to restore a failing project back to normal.

The grocery management taking up an alternate approach because of its competitor, Walmart followed a Contingent plan.