solve it---**Question:** 27 The three waves shown in each diagram have the same amplitude and frequency but different phase. They are added together to give a resultant wave. In which case is the resultant wave zero at this instant? **Options:** A B C D **Chart Description:** The image displays four diagrams, labeled A, B, C, and D, arranged in a 2x2 grid. Each diagram shows a horizontal line representing the equilibrium position and three superimposed sinusoidal waves. All waves appear to have the same amplitude and frequency. The waves in each diagram have different phase relationships relative to each other and relative to the starting point (left edge of the diagram). The horizontal axis represents position or time, and the vertical axis represents displacement. The question asks about the "instant" which corresponds to the leftmost point shown in each diagram. **Diagram A:** Shows three waves starting at the leftmost point. One wave starts at the equilibrium position and goes upwards. The second wave starts at its maximum positive displacement. The third wave starts at its maximum negative displacement. **Diagram B:** Shows three waves starting at the leftmost point. One wave starts at the equilibrium position and goes upwards. The second wave starts above the equilibrium position, moving downwards. The third wave starts below the equilibrium position, moving upwards. **Diagram C:** Shows three waves starting at the leftmost point. All three waves start at the equilibrium position and go upwards. **Diagram D:** Shows three waves starting at the leftmost point. One wave starts at the equilibrium position and goes upwards. The second wave starts at its maximum positive displacement. The third wave starts at the equilibrium position and goes downwards.