Which of the following about the controlling idea is not true?

A、Aparagraphisasentenceorgroupofsentencesthatsupportonemainidea.That’swhatwecallthe“controllingidea”becauseitcontrolswhathappensintherestoftheparagraph.;
B、Theinformationineachparagraphmustberelatedtothatidea.;
C、Itisaboutthemostimportantideathatyouaretryingtoconveytoyourreaderinaparagraph.;
D、Itisalwaysthefirstsentence.