Question

Which of the following are explicit indicators?

a. intentional obvious conclusions
b. always, never, and sometimes
c. fact and opinion
d. because, for, and since

Answer 1

Explicit indicators are indicators are fully and unambiguously express something and leave nothing implied, not clear.

I would need more context to be sure about how the terms above are used, but because, for, and since can play a role of explicit indicators, for example in:

Because I was hungry, I ate (the reason for eating is stated explicitly, not implicitly).