A French publishing company said Tuesday that it “bitterly regrets” allowing one of its history books to state that the C.I.A. orchestrated the Sept. 11, 2001, attacks and that the misinformation echoed conspiracy theories “devoid of any factual basis.”

The book, “History of the 20th Century in Cards,” which covers French, European and world history in the 20th century, was published by Éditions Ellipses in November. It was intended for high school students and those preparing for university entrance exams.

In a chapter about Middle East conflicts in the 20th and 21st centuries, a sentence about the attacks reads: “This world event — probably orchestrated by the C.I.A. (secret services) to impose American influence on the Middle East?”

The line was initially discovered by a history teacher’s child, and it was widely discussed this week in a closed Facebook group for members of Les Clionautes, an association for history and geography teachers, Bruno Modica, a spokesman for the association, said on Tuesday.