Question

Which sentence shows a flaw or mistake in logic?
Cassette tapes were replaced by CD players, which in turn have given way to digital music players.
Violent crime in the U.S. fell every year until 2004, when digital music players became widespread, leading to a rise in crime.
Smartphones, which let users listen to music, take photographs, and do other tasks, led to a drop in digital music player sales.
Some medical professionals are concerned that the extensive use of earbuds and headphones may lead to hearing loss.

Answer 1

The answer would be B, "Violent crime in the U.S. fell every year until 2004, when digital music players became widespread, leading to a rise in crime" because the logic states that digital music players are the cause of the rise of violent crime.

Answer 2

Sentence 2. Just because digital music players are being sold doesn't mean that crime rises. (if it does, it would be merely coincidental)