As Art Was Walking Out the Door of His Apartment,he

As Art was walking out the door of his apartment,he was quickly running through a mental list of all the things he was supposed to take with him.He went through the complete list of items four or five times,just to make sure he hadn't forgotten anything.Which memory component was Art using,based on Baddeley's model of working memory

A)  visuospatial sketchpad 
B)  prospective memory 
C)  executive control system 
D)  phonological loop