Use the Associative Property of Multiplication to Write an Equivalent $( 6 \cdot 3 ) x$

Multiple Choice

Use the associative property of multiplication to write an equivalent algebraic expression.
-6(3x)

A) $( 6 \cdot 3 ) x$
B) $( 6 \cdot 3 ) + x$
C) $( 6 + 3 ) x$
D) $6 ( 3 + x )$