Answer:
Words and phrases used in the PR industry.
Step-by-step explanation:
Such words and phrases used in the PR industry that other people not in such industry is known as "jargon" .
She began to use jargons that only people in the PR industry would understand.
The audience is full of interns that presumably, they are not professionals in the PR industry ,so when she began using these words they got lost and lost interest.
So therefore, it was the words and phrases used in the PR industry called "jargons" that made the audience lose interests.