Scientists might predict that the following could happen due to solar flares:
A) high-frequency radio waves used for radio communication will be blocked
B) radio navigation systems and global positioning systems will be inaccurate
C) electrical systems in satellites will fail
D) power grid operations will go offline
All of the provided options are potential effects of solar flares. However, if you are looking for the most accurate or expected outcomes, options B and D are particularly significant in terms of their implications for navigation systems and large-scale infrastructure.