Answer:
C
Explanation:
the tangent- chord angle CED is half the measure of its intercepted arc CE
then
CE = 2 × ∠ CED = 2 × 68° = 136°
the sum of the arcs in a circle = 360° , that is
EB + BC + CE = 360°
128° + BC + 136° = 360°
BC + 264° = 360° ( subtract 264° from both sides )
BC = 96°