I believe it’s
D.51is it B ??
I believe the answer is Associative Property of Addition, I may be wrong. If i am my apologies.
Answer:

Step-by-step explanation:
The given expresion is

Observe that 4 is common to 8,-24, and 4
Observe also that, m²n is common to all the terms.
Hence the GCF is:4m²n
We factor the GCF to get;

38.21$ that is how much more than average