An Experiment Consists of Three Stages

An experiment consists of three stages. There are two possible outcomes in the first stage, three possible outcomes in the second stage, and four possible outcomes in the third stage. Drawing a tree diagram for this experiment will show that the total number of outcomes is: $\begin{array}{|l|l|}\hline \text { A. } & 9 . \\\hline \text { B. } & 24 . \\\hline \text { C. } & 26 . \\\hline \text { D. } & 18 . \\\hline\end{array}$