Jeffreys, a research, is conducting a drug trial in a controlled environment. He manipulates several variables and measures the effect of each variable on the subjects of the trial. In this scenario, Dr. Jeffreys is using the method.

experiment

Explanation:

Experiment method: In research, the term experiment method is described as a method of investigation whereby a specific hypothesis is being scientifically tested. Therefore, in the experiment method, a dependent variable is being tested or measured by the researcher, an independent variable is being changed or manipulated, and any extraneous variables are being controlled by the experimenter, investigator or researcher.

Advantage: The experiment method is objective in nature.

In the question above, Dr. Jeffreys is using the experimental method.

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.

aliens are not real, the myth was created about 700 years ago because people found markings in the field of their crops. also, no there were no aliens on the moon.

hope this ! give brainliest!