If you find evidence that contradicts your ideas what does that tell you A that all of your prior evidence was inaccurate B that you may need to adjust your opinion C that you need to find more evidence to support your own idea D that your opinion has strong foundation

B that you may need to adjust your opinion

Finding evidence that contradicts your ideas typically suggests that you should reconsider your position and possibly adjust your opinion in light of new information. It's a critical part of scientific thinking and rational discourse to remain open to changing one's views based on new evidence.