How was a successor to muhammad chosen?

a) muhammad named his successor before dying.

b)an angel was said to have revealed muhammad’s successor.

c)muhammad’s successor was elected by the clans.

d)the successor to muhammad was named in the qur’an.

First: a successor for Muhammad had to be chosen, because none of his sons survived to adulthood, so a hereditary succession was not in question. 

A successor to Muhammad (or generally a religious and political leader) is called caliph. The first caliph was chosen by recommendation from many of Muhammad comrades, most notably by Umar (who was a caliph later), and it was Abu Bakr. 

The choice was disputed and some believed it should be Ali should be the rightful successor. 

In general, the successor was chosen by recommendation from others and choice among the leading figures.

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

your answer is "graduates" hope this