B). When people lie, the consequences are usually dire.
Explanation:
The story 'A Good Man is Hard to Find' primarily deals with the underlying idea as well as message that unifies the narrative in a single thought i.e. 'brutal consequences of lieing and test of faith.'
As per the question, option B i.e. 'When people lie, the consequences are usually dire' most appropriately identifies the underlying idea(theme) of the story. It reveals that how Grandmother's lie lead to the barbaric consequences which leads the entire family to 'the mouth of death.' Thus, <u>option B</u> is the correct answer.
