[Q]: Would the following sentence, by the strictest standards, be considered correct? The passengers who had known that the train was not on fire said that those who had thought so had barricaded themselves in the bathrooms.
++++++++++
[A]: acceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? John had an error in the proof Sarah presented.
++++++++++
[A]: unacceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? Ellen complained about the situation.
++++++++++
[A]:
acceptable