The number of sunspots may affect the amount of volcanic activity on earth.?

If I found this question on a geology exam, I would answer false. The amount of force placed on a fault by sunspot activity would be hardly measurable. In fact it has only been shown recently that water behind a dam in China can effect earthquakes, and the effect is largely due to lubrication of the fault by water, not the added pressure of the water. The effect of a sunspot would be much less than the water behind a dam.