Set A is arranged in ascending order of the values

GRE Quant Problem Solving
1

Set A is arranged in ascending order of the values.
QTY A: Mean of set A
QTY B: Median of set B
Correct ans: A

My solution:
taking an example set: {1,7,8,9}
here mean=5, median=7.5
This clearly contradicts the answer. Is this possibly a wrong answer?

Given Solution:

Read more at: https://edurev.in/question/4019767/Set-A-arranged-in-ascending-order-of-the-valuesQuantity-A-Mean-of-Set-AQuantity-B-Median-of-Set-Aa-Q

Am I not getting the question or the way of visualising the problem is incorrect?