The correct answer for the question that is being presented above is this one: "116.62 feet." The shortest distance Amy has to walk to reach Alice is 116.62 feet.
This can be answered using Pythagorean theorme:
h2 = a2 + b2
h2 = 100^2 + 60^2
h2 = 10000 + 3600
h = square root (13600)
h =116.62 feet