Which alternative correctly shows the associative property of integers under addition?

• A.  \[\left\{ \left( -10 \right)\times 6 \right\}+3=(-10)+2\times 6+3\]
• B.  \[\left\{ \left( -9 \right)+6 \right\}+2=(-9)+\left\{ 6+2 \right\}\]
• C.  \[\left( -9 \right)\times 6=6\times (-9)\]           
• D.  All of these