Answer:
Option E 15 cm
Explanation:
we know that
The circumference of a circle subtends a central angle of 360 degrees
so
using proportion
Find out the length of arc DE by a central angle of 45 degrees
Let
x -----> the length of arc DE
\frac{120}{360}=\frac{x}{45}\\\\x=120*45/360\\\\x=15\ cm