Correct Answer: deliberate

Solution : The correct choice is the third option.

In this context, the correct choice should contrast with inadvertent, which means unintentional or accidental. Therefore, deliberate is the correct antonym, as it means intentional or done with careful consideration.

The meanings of the other options are as follows:

• Unintentional: This word means unintentional or accidental.
• Peevish: This word means easily irritated or annoyed.
• Impious: This word means lacking reverence or showing a lack of respect.