Which of the following substances cause temporary hardness in water?_x005F_x000D_ 1. Mg(HCO3)2_x005F_x000D_ 2. Ca(HCO3)2_x005F_x000D_ 3. CaCl2_x005F_x000D_ 4. MgSO4

• A. 3 and 4
• B. 2and 3
• C. 1 and 4
• D. 1 and 2