The Iranian Revolution of 1979 had a profound impact on the politics of Arab countries, primarily because it demonstrated that a government could be successfully founded on religious principles, specifically Shia Islam. This was significant across the region as it challenged existing secular regimes and inspired political movements that sought to incorporate Islamic principles into governance.
The revolution also highlighted the possibility of grassroots mobilization against authoritarian regimes, which many Arab countries were experiencing at the time. The Iranian model of Islamic governance provided a new framework that some groups in Arab nations sought to emulate, leading to a rise in Islamic political movements and parties.
Furthermore, the success of the Iranian Revolution served as a source of inspiration for both Shia and Sunni groups throughout the Middle East, promoting the idea that Islam could serve as a unifying force against Western influence and local authoritarianism. Additionally, Iranian ideas about governance, social justice, and the role of religious institutions proliferated across borders, impacting the political landscape in various Arab countries.
Thus, the most relevant points from your options are: the Iranian Revolution demonstrated that it was possible to base a government on religion, and Iranian ideas about Islam spread throughout the Middle East.