I think it's C cause it might be your primary source unless you have a video or something then it would become you second source
Using commandments as guides for behaviour
The printing press allowed mass production of books that spread new scientific revolution.
Social mobility
It is the movement of an individual or household from one strata of society to a higher strata. it can be necessitated by several factors such as impeccable talents such as beauty,skills or charisma. this is only possible in an open stratification system that recognizes achieved status.
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