Find, Correct to the Nearest Degree, the Angle Between the Planes

Multiple Choice

Find, correct to the nearest degree, the angle between the planes. Select the correct answer.
$$x + y - z = 1,3 x - 13 y + 6 z = 5$$

A) $129 ^ { \circ }$
B) $8 ^ { \circ }$
C) $5 ^ { \circ }$
D) $102 ^ { \circ }$
E) none of these