Option (c)

This question is with reference with the line "When Paine says that the long habit of not thinking a thing wrong creates the superficial impression of its being right, he brings to our attention the fact that the long habit of not thinking a thing wrong makes it unlikely that we will think to change it."

So there are 2 consequences of not thinking a thing wrong –
1) You think you are right
2) You are unlikely to change

Murali thinks his action is legal and he doesn’t want to change.
Only option c) illustrates both the consequences.