To simplify the expression \(\frac{x^{\frac{4}{3}}}{x^{\frac{1}{3}}}\), we can use the property of exponents that states \(\frac{a^m}{a^n} = a^{m-n}\).
Applying this property, we have:
\[ \frac{x^{\frac{4}{3}}}{x^{\frac{1}{3}}} = x^{\frac{4}{3} - \frac{1}{3}} = x^{\frac{4 - 1}{3}} = x^{\frac{3}{3}} = x^1 = x \]
Thus, the expression simplifies to \(x\).
The correct answer is: C. \(x\).