by ohthatpatrick Mon Feb 25, 2019 3:59 pm
In its local context, the cultural cross-fertilization is getting at the idea that "the press saw that they could profit from studios' promotion of films". The beginning of that sentence sort of establishes that "While it's obvious that the Hollywood benefits from this promotional zeal ... the important feature of this relationship was the surprising benefit received by the press".
(E) is referring to something said in the previous sentence. There were interactions between public relations agents and the press ... leading to more public curiosity in the lives of movie stars ... leading to more success for star-driven movies and, unexpectedly, to more success for the press itself.
That last bit is labeled cultural cross-fertilization in lines 14-19.
The first bit is farther upstream, and was not labeled by the passage as cultural cross-fertilization.