Answer: B) 7.99 meters
Step-by-step explanation:
The formula to find the length of arc having center angle 'x' is given by :-
, where C is the circumference of the circle.
Given : Circumference : 23 meters
Central angle subtended by arc AB: 
Now, the length of arc AB is given by :-

Hence, the length of arc AB = 7.99 meters.