We can have different approach here

we can use numbers and we can use theory

Using theory a key point in our favor is the fact that the numbers are 7, which means they are odd numbers

From this we do know that 3 numbers are above the median and 3 are below the median.

The median, in this case, can be easy = to five but also NOT

Also we do know anything about the numbers but they are seven. maybe are equal.

just brainstorming this you can solve the question in 30 seconds

The answer is D