Find the Value of X,y and Z in the Figure

Multiple Choice

Find the value of x,y and z in the figure.​ ​ where a = 3
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A) ​x = 60°,y = 60°,z = 57°
B) ​x = 60°,y = 63°,z = 57°
C) ​x = 63°,y = 63°,z = 57°
D) ​x = 57°,y = 63°,z = 60°
E) ​x = 60°,y = 60°,z = 60°