(B) The Wenckebach phenomenon (also known as Mobitz type $I$ second-degree $AV$ block) is a type of partial heart block.In this condition,the $P-R$ in

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(B) The Wenckebach phenomenon (also known as Mobitz type $I$ second-degree $AV$ block) is a type of partial heart block.In this condition,the $P-R$ interval progressively lengthens with each successive beat until a $P$ wave fails to be followed by a $QRS$ complex (a dropped beat).This cycle then repeats itself.