How do pKa values relate to the acidity and potential extraction behavior of a compound?

Higher pKa indicates higher acidity, making the compound more likely be extracted in protonated form in basic condition.

Higher pKa indicates higher acidity, making the compound more likely be extracted in protonated form in acidic condition.

Lower pKa indicates higher acidity, making the compound more likely be extracted in deprotonated form in basic condition.

Lower pKa indicates lower acidity, making the compound more likely be extracted in deprotonated form in acidic condition.