A major advantage of closed-ended questions is that they: A. Are analyzed in a straightforward manner B. Encourage in-depth responses C. Are easy to construct D. Are not subject to response biases

A.

Explanation:

A major advantage of closed-ended questions is that they are analyzed in a straightforward manner. A closed-ended question is a question that can be answered by a simple yes or no answer, and there is only one correct answer. Therefore when it is being analyzed it can either be correct or wrong and there is no other option, unlike open ended answers which are in-depth and can have various explanations.

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.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.