sunspots are planet - sized islands of magnet...
sunspots are planet - sized islands of magnetism on the surface of the sun. they are the source of solar flares, coronal mass ejections and intense uv radiation. based on nasa data of recent sunspot activity, we can expect\na predictable cycles of disturbances in radio and satellite communication systems on earth\nb continual disturbances of radio and satellite communications systems on earth\nc infrequent disturbances of radio and satellite communications on earth\nd amazing auroras in northern latitudes on earth every winter.
Answer
# Brief Explanations:
Sunspots have an 11 - year cycle. Solar flares and coronal mass ejections associated with sunspots can cause disturbances in radio and satellite communication systems on Earth in a predictable cycle. Continual disturbances are not accurate as it's cyclical. Infrequent is wrong as it's a regular cycle. Auroras are not directly related to sunspot - cycle in the way described in option D.
# Answer:
A. predictable cycles of disturbances in radio and satellite communication systems on Earth