The common problem in Tunisia and Egypt that led to the Arab Spring was the frustration with dictatorships. Option A is correct.
During the Arab Spring in Tunisia, Egypt, and Libya citizens overthrew their dictatorial governments.
Since people believed that the dictator lived a life of luxury while the common people found it hard to earn a decent living increasingly protest led to the overthrown of the dictator of Tunisia. Eventually, the protests inspired similar uprisings in Arab world's largest country, Egypt.