(D) To simplify the expression $3^{\frac{2}{3}} \cdot 3^{\frac{4}{3}}$,we use the law of exponents: $a^m \cdot a^n = a^{m+n}$.Applying this rule,we ge

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(D) To simplify the expression $3^{\frac{2}{3}} \cdot 3^{\frac{4}{3}}$,we use the law of exponents: $a^m \cdot a^n = a^{m+n}$.Applying this rule,we get:$3^{\frac{2}{3}} \cdot 3^{\frac{4}{3}} = 3^{\frac{2}{3} + \frac{4}{3}}$$= 3^{\frac{2+4}{3}}$$= 3^{\frac{6}{3}}$$= 3^2$$= 9$