D also had must. I think both the ‘must’ and ‘therefore’ being in both prompts is more convincing

If you use the LSAT Study GPT it has been getting all the right answers for me

Essentially the argument is based on this research study done over the past 25 years. But what if the true cause of increased skin cancer was an issue that stemmed from 60 or 70 years ago? It’s like trying to figure out why Vietnam veterans have similar chronic diseases and cancers, using a study from the 90s to now, not taking into account Agent Orange.

This is all to say that it can be considered inside of the argument, but yes we assume the answer choices are true due to ‘which of the following if true’ in the original question.