LSAT Practice Test 2026 - Free LSAT Practice Questions and Study Guide

"In addition" is used as an additional premise indicator because it signifies that another premise is being added to support the argument. The phrase "in addition" implies that the statement following it is providing further support or evidence for the conclusion being made. This helps the reader understand that more reasons or evidence are being presented to strengthen the argument.

As for the other options:

A. "Besides" is not typically used as an additional premise indicator. It is often used to introduce an alternative or an additional point, rather than as a premise indicator.

C. "After all" is used more as a qualifier or a mitigating phrase rather than a premise indicator. It is not commonly used to signal the introduction of an additional premise.

D. "Therefore" is a conclusion indicator, not an additional premise indicator. It is often used to show the result or conclusion that follows from the premises presented.