Step 1: Understanding the separation techniques.
- Fractional distillation is used to separate mixtures with different boiling points. Crude oil consists of a mixture of hydrocarbons, and fractional distillation is used to separate them based on their boiling points.
- Steam distillation is used for separating compounds that are sensitive to heat. This technique is not ideal for separating crude oil.
Step 2: Conclusion.
Therefore, the correct matching pair is Crude oil/petroleum and fractional distillation, which corresponds to option (D).