Determine the Angle Between the Diagonal of a Cube and Its

Multiple Choice

Determine the angle between the diagonal of a cube and its edge,as shown in the figure,where $a = 12$ .Round your answer to one decimal place.? ?

A) 56.7^o
B) 57.7^o
C) 55.7^o
D) 54.7^o
E) 58.7^o ?