Explanation:

• The core of the Sun is at a temperature of about 15 million degrees, its outer layer, the photosphere is only 5700 degrees hot. However, its corona or outer atmosphere is at a much much higher temperature of about one million degrees. Which means temperature increases as one move outwards towards the photosphere and corona.
• Magnetic reconnection is a process where opposite polarity magnetic field lines connect and some of the magnetic energy is converted to heat energy and also kinetic energy which leads to the generation of heating, solar flares, solar jets, etc.
• The strength of the sun's magnetic field is typically only about twice as strong as Earth's field. However, it becomes highly concentrated in small areas, reaching up to 3,000 times stronger than usual.

Hence only statements 2&3 are correct.