Final answer:
Without additional context or measurements, it's impossible to determine the approximate horizontal distance between Amelia and Brendon from the options provided.
Step-by-step explanation:
To find the approximate horizontal distance between Amelia and Brendon, we would need more information than what is provided. If we were given the actual numbers or context such as how many steps they are apart, or a map scale, then we could calculate or estimate the distance accurately. Without such information, we can't determine whether the distance is 10 meters, 20 meters, 30 meters, or 40 meters, as we have no reference point or measurement to base our answer upon.