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Answer:
C
Step-by-step explanation:
the measure of an inscribed angle is half the measure of its intercepted arc, so
arc DE = 2 × ∠ DFE = 2 × 18° = 36°
DF is a diameter of the circle , then
arc DEF = 180° , then
arc EF = 180° - 36° = 144°
Now
mEF and m DE lies in one line hence supplementary
mEF:-