$\text{I. B}$

${\left(2\frac{1}{3}\right)}^5\cdot {\text{a}}^5\cdot 3^5\cdot {\text{b}}^5\cdot {\text{c}}^5={\left(2\frac{1}{3}\cdot \text{a}\cdot 3\cdot \text{b}\cdot \text{c}\right)}^5={\left(\frac{7}{{\sout{3}}^1}\cdot \text{a}\cdot \sout{3}\cdot \text{b}\cdot \text{c}\right)}^5={\left(7\text{abc}\right)}^5$