Chemistry in Everyday Life

Option A: Cetyltrimethylammonium bromide
→ This is a cationic detergent (a quaternary ammonium compound). Thus, it is a synthetic detergent.
Option B: Sodium stearate
→ This is the sodium salt of a fatty acid (stearic acid) - it is a soap, not a synthetic detergent.
Option C: Sodium laurylsulphate
→ This is an anionic synthetic detergent (commonly called SDS or SLS).
Option D: Sodium dodecylbenzenesulphonate
→ This is also an anionic synthetic detergent, one of the most commonly used (found in many household detergents).