Saudi Arabia- Most authoritarian
Israel- Less authoritarian
Lebanon- Less authoritarian
Syria- Most authoritarian
Explanation:
Saudi Arabia, Israel, Iraq, Iran, Syria, Lebanon all are countries of middle east where these countries are located. Among all the middle east countries Saudi Arabia has most authoritarian government because it is governed by king. And king applied dictatorship here that must be followed by every citizen of the country.
Israel and Lebanon has less authoratarian government where king's dictatorship is slightly loose and democratic environment prevails. Syria has most authoritarian ruling system like Saudi Arabia.