A.
The characteristic roots are 1(repeated twice) and 3.
B.
The eigenvector[1, 0, 0] is c orresponding to root 3.
C.
The eigenvector[1, 0, 0] is c orresponding to root 1.
D.
[0, 0, 1; 0, 1, 0; 1, 0, 0] is an orhogonal eigenmatrix for matrix
E.
[1, 0, 0; 0, 1, 0; 0, 0, 1] is an orhogonal eigenmatrix for matrix