Question

Because mass communication theories are created by people, and therefore influenced by human biases, the times in which we live, the position you occupy in the mass communication process, and a host of other factors, we can say that these theories are:

Answer 1

We can say that these theories are human constructions.
These theories were constructed, or created by humans, which makes them human constructions. They didn't exist before humans made them - they weren't previously part of nature around us. Rather we created them to suit our own needs and to make us understand life in general. 

Answer 2

Because mass communication theories are created by people, and therefore influenced by human biases, the times in which we live, the position you occupy in the mass communication process, and a host of other factors, we can say that these theories are human constructions.