The correct answer is A. Increasing the area of the plates.
The capacitance of a capacitor is given by the formula:
$C = \frac{\epsilon_0 A}{d}$
where $C$ is the capacitance, $\epsilon_0$ is the permittivity of free space, $A$ is the area of the plates, and $d$ is the distance between the plates.
Therefore, the capacitance is proportional
to the area of the plates. Increasing the area of the plates will increase the capacitance.Option B is incorrect because decreasing the area of the plates will decrease the capacitance.
Option C is incorrect because increasing the frequency of the applied voltage will not affect the capacitance.
Option D is incorrect because increasing the voltage applied to the plates will not affect the capacitance.
Option E is incorrect because increasing the area of the plates is the only way to increase the capacitance.