Correct Answer: Compassionate

Solution : The correct antonym is the fourth option: Compassionate.

Explanation for each option:

1. Malicious - This word is a synonym of "pernicious" and does not provide an appropriate antonym. Both words have a similar meaning of causing harm or being harmful.

2. Wicked - This word is also a synonym of "pernicious" and does not serve as an antonym. Both words convey the idea of causing harm or being morally wrong.

3. Injurious - Similar to the previous options, this word is a synonym of "pernicious" and does not offer an appropriate antonym. It also means causing harm.

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4. Compassionate - This word is the antonym of "pernicious" as it conveys the opposite meaning of showing kindness, empathy, and concern, rather than causing harm.