All scientific knowledge is provisional. Everything that science knows, even the most mundane facts and long-established theories, is subject to re-examination as new information comes in. the latest data and ideas are scrutinised the most. Some recantations will be unavoidable, but this is not a weakness of science, but rather its strength. No endeavor rivals science in its incremental progress towards a more complete understanding of the observable universe.

Question: Science improves understanding on the basis of leaving unchallenged those theories that appear to work.
Options:
A. true, B. false, C. uncertain
Answer: "B"