19. Which words have horizontal reflection symmetry? \begin{tabular}{ll} A) BOOK & (C) CHECK \\ (B) POP & (D) SUCCEED \\ \hline\end{tabular}

To determine which words have horizontal reflection symmetry, we need to analyze each word to see if it looks the same when reflected across a horizontal line through its center. 1. **BOOK**: - When reflected horizontally, the letters "B" and "K" do not maintain their appearance. Therefore, "BOOK" does not have horizontal reflection symmetry. 2. **POP**: - When reflected horizontally, the letters "P" and "O" maintain their appearance. The word "POP" looks the same when reflected. Therefore, "POP" has horizontal reflection symmetry. 3. **CHECK**: - When reflected horizontally, the letters "C", "H", and "K" do not maintain their appearance. Therefore, "CHECK" does not have horizontal reflection symmetry. 4. **SUCCEED**: - When reflected horizontally, the letters "S", "U", "C", "E", and "D" do not maintain their appearance. Therefore, "SUCCEED" does not have horizontal reflection symmetry. Based on this analysis, the only word that has horizontal reflection symmetry is: **B) POP**.