Phosphoric acid is produced in wet process from phosphate rock and$?

• A. Dilute H‚Äö√á√áSO‚Äö√á√ë
• B. Concentrated H‚Äö√á√áSO‚Äö√á√ë
• C. Concentrated NHO‚Äö√á√â
• D. Concentrated HCl