Answer:
Wikipedia
Step-by-step explanation:
Scientific studies and science reviews are made by the scientific community after countless trials and experiments. They give you a wide range of data and sources that you can rely on.
Encyclopedias are also reliable due to the fact that they usually don’t have fictional facts and are created to discuss about historical facts and such.
Wikipedia is the least credible source because anybody can produce an article. If this is the case, you can make up anything, even things that are not true.