The two phrases that represent correct matches between cause and effect are:
-
solar flare - sudden release of magnetic energy
This is a correct match because solar flares are indeed caused by the sudden release of magnetic energy stored in the sun's atmosphere. -
coronal mass ejection - sudden eruptions of large bubbles of plasma and magnetic energy
This is also a correct match as coronal mass ejections (CMEs) are large expulsions of plasma and magnetic fields from the solar corona, which can result in significant solar activity.
The other options do not correctly match cause and effect.