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If dielectric constant and dielectric strength be denoted by K and X respectively, then a material suitable for use as a dielectric in a capacitor must have:
high K and high X
high K and low X
low K and low X
low K and high X

A

low K and high X

B

high K and low X

C

high K and high X

D

low K and low X

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Solution

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Dielectric is an insulator with a dielectric constant $K$ used between the plates of the capacitor to increase the capacitance of the capacitor by a factor of $K$
The capacitance of a Capacitor with dielectric $C \propto K$ , $K$ is the dielectric constant
Electric field strength $X$ is the measure of the maximum electric field strength. These are the fields above which the material breaks and began to conduct. Dielectric field imposes a limit on the maximum voltage that can be applied for given plate separation.
Hence material with $h i g h$ $K$ and $h i g h$ $X$ is suitable for use as a dielectric in a capacitor

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