The option (B) is correct. Associative property was applied to create the given expression.
Given expression is 7x+(5+6x) rightarrow (7x+5)+6x.
Firstly, check the given expression by commutative property.
The commutative property of addition is a+b=b+a and the commutative property of multiplication is a×b=b×a.
The commutative property didn't satisfy the given expression.
Now, check the given expression by associative property.
The associative property of addition is (a+b)+c=a+(b+c) and the commutative property of multiplication is (a×b)×c=a×(b×c).
The associative property of addition satisfy the given expression.
Further, check the given expression by distributive property.
The distributive property is a×(b+c)=ab+bc.
The distributive property didn't satisfy the given expression.
Hence, the given expression 7x+(5+6x) rightarrow (7x+5)+5x s created by the associative property.
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