What is one way that historians can establish the authenticity of a primary source?

A historian can establish the authenticity of a primary source by questioning it.

Explanation:

There are several things that historians can question about a source, the first of all is, Was the source created at the same time of the event it describes?, then Who is the author or provider of this information?, Is the information logical an accurate according to the time period? Do other sources mention similar information or even the same information?

the catholic church withhold people's access to the bible during the middle ages.

people could go to church and listen to the teachings, but it was absolutely forbidden to own and/or read the books of both the old and new testaments. it was also prohibited to translate the books (which where originally in biblical hebrew) to any other language.

this was done so the church could remain in control of what their teachings were and to enhance their importance and power, while also being able to judge people's actions through information that was unavailable for the general public.