Which of the following scientific discoveries, made in the 1950s and 1960s, provided the definitive physical mechanism and proof that Wegener's continental drift hypothesis was correct, leading to the modern theory of Plate Tectonics?

Options:

• A: The discovery of the Moho discontinuity and the layering of the Earth's core.
• B: The mapping of the mid-oceanic ridges and the discovery of symmetrical magnetic anomalies (paleomagnetism) on the ocean floor.
• C: The measurement of tidal forces acting on the continents using satellite geodesy.
• D: The discovery of deep-sea trenches and the classification of marine fossils in the abyssal plains.

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