For this case we have that by definition, the associative property is defined as:
[tex](a * b) * c = a * (b * c)[/tex]
So, if we have the following expression:
[tex]7 * (8 * 9) = (7 * 8) * 9[/tex]
According to the mentioned property we can verify that it is the associative property.
Answer:
Associative property
Option D