When an author uses ethos, they are trying to make the information look trustworthy enough that you believe what they are saying is true.
The correct answer is 'empty word', because such words don't really have an important meaning, they are there just as grammatical links or markers. They only have grammatical function, and no meanings in themselves.
The other options are incorrect, 'there' doesn't fit in any of them.
ALL CREDIT TO THIS: brainly.com/question/859473