What is the reaction involved in Holmes signal?

• A. Ca3P2 + 6H2O → 2PH3 + 3Ca(OH) 2
• B. Ca3P2 + 6H2O → 2PH3 → P2H4 + P4O6 and CaC2 + H2O → C2H2
• C. Ca3P2 + 6HCl → 2PH3 + 3CaCl2
• D. P4 + 3NaOH + 3H2O → PH3 + 3NaH2PO2