11) E

1 – Correct
Those who had been taking cannabis for 15 years recalled less words than those who had been taking it for 7 years. Also, those who had been taking cannabis for 7 years recalled less words than those who had never smoked cannabis. This shows that long-term smoking had an impact on the ability of a person to learn and remember.

2 – Correct
Another explanation could be that cannabis’ effect lasts for more than 24 hours which explains the results that we got.

3 – Correct
This could also be true. Difference in IQs could be the reason why such results were obtained, independent of cannabis smoking.

Since all three statements are correct, E is the answer.

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