Answer:
Both Amy and Fraser walk distances equal to the radius of the lawn.
Step-by-step explanation:
The radius of a circle is a line segment from the center to the outside edge (circumference).
Amy walks from O, the center, to A, along the outside edge, using segment OA. This is a radius of the circle.
Fraser walks from O, the center, to B, along the outside edge, using segment OB. This is a radius of the circle.
Thus the correct answer is that both Amy and Fraser walk distances equal to the radius of the lawn.