Why is the answer for this question TRUE? [closed]

I believe the exam question has mistakes in it.

According to recent data about 21% of adult smokers used e-cigarettes in 2015, which is more than double the rate in 2016.

This statement is very strangely worded. Normally you'd talk about the current (or most recent) situation, then compare it to a previous (older) situation. That's how time works: it goes forwards.

I believe it contains a typo and the years have been accidentally swapped.

This is consistent with the question, which you now know to be true. It makes most sense as well.

  1. In 2016 twice as many people used e-cigerattes as in the previous year. TRUE

To me, the question is also incorrectly worded. You cannot say "twice as many did something as in the previous year". You can say "than in" or "compared to" the previous year.