are unplanned responses to risk events used when project teams do not have contingency plan in place. A) Workarounds. B) Fallback plans.
C) Contingency plans.
D) Triggers.

B) Fallback plans.  

Explanation:

Fallback plan: The term "fallback plan" is described as a backup plan that is being related to the contingency plan. Thus, it comes into consideration when the contingency plan is being failed to get implemented ans similarly when the fallback plan failed to work then the contingency plan comes into consideration.

In the question above, the given statement represents the fallback plans.

the answer is c