The Associative Property states that the way in which numbers are grouped in addition or multiplication does not change their sum or product. This means that for addition, \( (a + b) + c = a + (b + c) \), and for multiplication, \( (a \times b) \times c = a \times (b \times c) \).
Looking at the given options:
A: \( (9 \times 5) \times (8 \times 3) \) - This involves multiplication, but it does not fit the associative property since it combines two products.
B: \( (5 \times 8) + 3 \) - This involves both multiplication and addition, but does not have a grouping that we can rearrange using just the associative property.
C: \( (9 \times 5) + 8 + 3 \) - This is addition, but again does not have a specific grouping that utilizes the associative property.
D: \( (5 + 8) \times 3 \) - This option can be rewritten using the associative property as \( 5 + (8 \times 3) \), which shows how we're grouping terms can change without affecting the outcome of addition and multiplication.
Thus, the best candidate here for applying the Associative Property is:
D: \( (5 + 8) \times 3 \).