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

• A. Higher pKa indicates higher acidity, making the compound more likely be extracted in protonated form in basic condition.
• B. Higher pKa indicates higher acidity, making the compound more likely be extracted in protonated form in acidic condition.
• C. Lower pKa indicates higher acidity, making the compound more likely be extracted in deprotonated form in basic condition.
• D. Lower pKa indicates lower acidity, making the compound more likely be extracted in deprotonated form in acidic condition.

Answer: (D)