Among the following which is not a horn clause?

• A. p
• B. ‚Äö√†√∂‚àö‚â§p V q
• C. p ‚Äö√Ñ√∂‚àö√∫‚àö‚↠q
• D. p ‚Äö√Ñ√∂‚àö√∫‚àö‚↠‚Äö√†√∂‚àö‚â§q