Israel and Turkey are the countries that have formed a multiparty democratic system. The correct option among all the options that are given in the question is the last option or option "d". This kind of system is very healthy for the people living in these countries. Various political parties can fight the election for going to power.
The "time signature" at the beginning of the piece tells how many beats
there will be in each measure, and what size note will receive one beat.
From there on, all the different size notes in the piece are figured from that.
It can even change during the piece, but if that happens, then there has to be
a new time signature at the place in the music where it changes.
Mixed economy is usually a market and a command economy mixed together. This type of economy is better than others since it has some government regulation but not total regulation. Since market economies are ruled by only consumers and command are only ruled by governments, it can cause a lot of economic problems for both, with businesses and fraud, so having a balanced mix between the two is better. (Sorry i have bad grammar english is not my first language
A country's motivation for a single-party government is most likely the want to keep the power within a certain group of people and to suppress political rivals from rising up and taking power from them. More often the current party is disliked to a certain extent and people would vote for another given the option.