Outside knowledge, extreme wording and scope shifts — the traps named, with examples.
The single biggest trap. The question asks what the passage supports, and the test writers deliberately pick claims your general knowledge agrees with. If your justification starts with anything other than a line of the passage, you are answering a different question. The passage is the only source of truth.
An option that overstates a hedged passage — turning 'many researchers believe' into 'researchers have proven' — is wrong, however close it sounds. And keep straight who claims what: a view the passage reports ('critics argue that…') is not the author's view, and an option that attributes it to the author is a trap, not a paraphrase.
Watch options that quietly widen the scope (from 'UK hospitals' to 'hospitals'), narrow it, or slide the tense — treating what the passage says happened as a prediction, or a plan as an outcome. Each shift produces an option that is almost what the passage said. Almost is False, or Can't tell — check which.