In the Above Decision Tree,Matthew Picks First and Dean Picks

Multiple Choice

In the above decision tree,Matthew picks first and Dean picks second.Matthew and Dean both know the payoffs to each choice for both themselves and each other.
-Refer to the decision tree above.If Matthew did not know Dean's payoffs,i.e. ,the values for Dean in the decision tree were missing,one could predict that

A) Matthew would pick Y.
B) Matthew would pick Z.
C) Matthew would prefer Y to Z.
D) Matthew would prefer Z to Y.
E) Matthew's preference would be unknown.