**Category:** Inorganic Chemistry  
**Subtype:** Chemical Reactions (Precipitation Reactions)  
**Problem Description:** Identify which pair of solutions will react to form a precipitate.  

**Options:**
A. Sodium carbonate (\(\mathrm{Na}_{2} \mathrm{CO}_{3}\)) and barium chloride (\(\mathrm{BaCl}_{2}\)).  
B. Potassium hydroxide (KOH) and sulfuric acid (\(\mathrm{H}_{2} \mathrm{SO}_{4}\)).  
C. Sodium carbonate (\(\mathrm{Na}_{2} \mathrm{CO}_{3}\)) and hydrochloric acid (HCl).  
D. Ammonium chloride (\(\mathrm{NH}_{4} \mathrm{Cl}\)) and sodium hydroxide (NaOH).  

**Task:** Determine which combination of these solutions will produce a solid precipitate when mixed.