$\backslash$table$[[$activity predecessors$],[$A$,,5,4,4500,8000],[$A$,$A$,4,3,3500,6000],[$B$,$B$,5,5,2000,2000],[$C$,$C$,3,1,3000,11000],[$D$,$B$,7,4,4500,7500],[$E$,$B$,6,6,5500,5500]]$

The table shows normal time, crash time, normal cost, crash cost of activities in a project. According to this table which activity must be crashed first? $($Only enter the name of