A conclusion indicator is a word or phrase that indicates that the statement it's attached to is a conclusion. ... Of the indicators we've seen so far, “thus,” “so,” and “hence” are also conclusion indicators, as can be verified in any reliable dictionary.

Which of the following are all conclusion indicators?

The words "therefore," "hence," "so," "since," and "thus" are all conclusion indicators.

Can Since be a conclusion indicator?

Since "therefore" introduces a conclusion, it is a conclusion indicator.