mistakenly

A valve designed to drain water from the plant’s fuel rods stuck open, yet operators mistakenly shut down water pumps, causing a partial meltdown.

Answer C: Many parents mistakenly consider the U.S.

In this disease, the body's own immune defenses mistakenly attack and destroy the insulin-producing islet cells in the pancreas.

Back in 2013, the Evening Standard mistakenly published details of George Osborne's Budget before he got to his feet in the Commons, including details of major announcements on tax.

"If some people have mistakenly inferred that this children's production has any content about the migrant situation which has sparked debate in the UK some nine years later, then their reaction is misplaced."