Step 1: Concept
Haloform reaction requires a methyl ketone ($R-CO-CH_3$) or a secondary alcohol with a methyl group.
Step 2: Meaning
The reagent used is $X_2 / NaOH$.
Step 3: Analysis
Propanone (Acetone, $CH_3-CO-CH_3$) contains the required methyl ketone group.
Step 4: Conclusion
Hence, the correct answer is Propanone.
Final Answer: (D)