1. **Problem:** Identify which of the given sentences is not a statement. 2. **Understanding a statement:** A statement is a sentence that is either true or false, but not both. 3. **Analyze each option:** - a) "Water is essential for health." This is a statement because it can be true or false (true in this case). - b) "3 + 5 = 8" This is a statement because it is a true mathematical fact. - c) "A triangle has three sides." This is a statement because it is true. - d) "How beautiful your country is?" This is a question, not a statement, because it does not assert a fact that can be true or false. 4. **Conclusion:** The sentence that is not a statement is option d). **Final answer:** d) How beautiful your country is?