Which of the following is a valid use of the associative property of addition?

A. $\displaystyle{5}+{3}+{8.5}-{3.2}={\left({5}+{3}\right)}+{8.5}+{\left(-{3.2}\right)}\usepackage{cmbright}\Huge\$

B. $\displaystyle{5}+{3}+{8.5}-{3.2}={5}+{3}+{\left({8.5}+{\left(-{3.2}\right)}\right)}\usepackage{cmbright}\Huge\$