A presents a hierarchical organization of risks based on categories such as operational, strategic, finance, external, and project management.
a. Risk Management Plan
b. Risk Register
c. Risk Breakdown Structure (RBS)
d. Decision Tree"

c) Risk Breakdown Structure (RBS)

Explanation:

Risk breakdown structure is the plan in which hierarchically divided as per identification of the risk.Risk is unplanned and sudden crisis that causes negative impact .It requires management and handling through subsequently diving them into section so that approaching and understanding can be easy during risk.It contains section like finance, external management, operational management etc.

Other options are incorrect because decision tree,risk management plan and risk register are not the concept in which categorizes of risk is dived for management.Thus, the correct option is option(c).

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