I apologize for any misunderstanding in my initial response. Let’s clarify your question regarding the evidence for continental movement.
Among the options provided, mapping the ocean floor is a critical method used to collect evidence of continental movement. It can reveal features such as mid-ocean ridges, rift valleys, and evidence of tectonic activity that are crucial for understanding continental drift and plate tectonics.
If you meant to indicate that "identifying the age of rocks in the seafloor" is a better option, it also indeed plays a key role in studying continental movement since it allows scientists to date the formation of the oceanic crust and understand the process of seafloor spreading.
Both options—mapping the ocean floor and identifying the age of rocks—are valid pieces of evidence for studying continental movement, but mapping the ocean floor often directly illustrates the physical changes associated with this process.
Thank you for your patience, and if you have more questions or need further information, feel free to ask!