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To determine the correct order of substances from highest to lowest pH, it's helpful to know the typical pH values for each:
1. **Lemon juice**: Typically has a pH of around 2 to 3 (acidic).
2. **Milk of magnesia**: Typically has a pH around 10 to 11 (basic).
3. **Distilled water**: Typically has a neutral pH of around 7.
Based on these typical pH values, the order from highest to lowest pH is:
1. **Milk of magnesia** (highest pH)
2. **Distilled water** (neutral pH)
3. **Lemon juice** (lowest pH)
Thus, the correct answer is:
**D. milk of magnesia, distilled water, lemon juice.**