Answer:
B
Step-by-step explanation:
First, Sage hiked 8.75 miles to lookout point.
Then, we need to find the distance between the Boulder and Lookout Point, this distance is the distance from the Start of the Trail to Lookout Point minus the distance from the start to the Giant Boulder, which is 8.75-4.25, which is 4.50, hence the answer is 8.75 + 4.50 or 13.25!
