Question

aspiration of minorities cannot be kept in check ______ the gun
with
through
under
by
from

Answer 1

by is the answer of question optn4

Answer 2

Correct answer - with

Aspiration of minorities cannot be kept in check with the gun .

We used with because in the sentence there is a tool of action that is "gun". Whenever you find any tool of action you have to use with
Another example :

She cut the apple with a knife.
Here tool of action is "knife", so we used "with"

Hope This Helps You!