Which of the following decision tree nodes have probability attached to their branches? 

Answer options:

A. Root node
B. Event node
C. End node
D. Decision node

B

Event nodes represents the possible uncertain outcomes of a risky decision, with at least two nodes to illustrate the positive and negative range of events. Probabilities are always attached to the branches of event nodes. Incorrect Answers: A: Root node is the starting node in the decision tree, and it has no branches. C: End node represents the outcomes of risk and decisions and probability is not attached to it. D: It represents the choice available to the decision maker, usually between a risky choice and its non-risky counterpart. As it represents only the choices available to the decision makers, hence probability is not attached to it.