Step 1: Concept
Gauss's Law states that the total electric flux ($\Phi$) through a closed surface is given by $\Phi = \frac{q_{enclosed}}{\epsilon_{0}}$.
Step 2: Analysis
According to Gauss's Law, the flux depends only on the net charge enclosed by the surface and the permittivity of the medium.
Step 3: Reasoning
It is explicitly independent of the shape, size, or geometry of the closed surface enclosing the charge. Since all three objects enclose the same charge $+q$, the flux is identical for all.
Step 4: Conclusion
The total flux through all three surfaces is equal.
Final Answer: (D)