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**Hint:**Before going through the question we should first know about dimension. The smallest number of coordinates required to specify a point within a mathematical space (or object) is known as its dimension in physics.

**Complete step by step answer:**

The term dielectric strength has the following definitions in physics:

-The maximum electric field that a pure electrically insulating material can withstand under ideal conditions without electrical breakdown and being electrically conductive (i.e. without failure of its insulating properties).

-The minimum applied electric field (i.e. the applied voltage divided by electrode separation distance) that causes breakdown for a particular piece of dielectric material and electrode position. The definition of breakdown voltage is as follows:

Dielectric strength is a material property that describes the maximum electric field that a pure material can withstand until its insulating properties begin to fail. It's also known as the maximum voltage needed to cause a dielectric breakdown.

The dielectric strength is measured in Volts per unit thickness \[\left( {V/m} \right)\] and is unaffected by the material or the electrodes that generate the electric field. It is a crucial property of an insulator, whose efficiency varies in direct proportion to the dielectric power.Dielectric strength means maximum electric field.

Unit of Dielectric strength =$\dfrac{N}{C}\,or\,\dfrac{V}{m}$

$\text{Dimensional formula} = \dfrac{{\left[ N \right]}}{{\left[ C \right]}}$

$\Rightarrow \dfrac{N}{C} = \dfrac{{{M^1}{L^1}{T^{ - 2}}}}{{{Q^1}}} \\

\Rightarrow \dfrac{N}{C} = {M^1}{L^1}{T^2}{Q^{ - 1}}$

$\therefore \dfrac{N}{C} = \left[ {{M^1}{L^1}{T^{ - 2}}{Q^{ - 1}}} \right]$

Dielectric dimensional formula =$[{M^1}{L^1}{T^{ - 2}}{Q^{ - 1}}]$

**So, the correct option is A.**

**Note:**Although they are connected, dielectric strength and dielectric constant should not be confused. The dielectric constant (also called "relative permittivity") is a dimensionless mathematical ratio of material permittivity to vacuum permittivity.

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