$\backslash$table$[[$ID$,$Description,Predecessor,$\backslash$table$[[$Time$],[($days$)]]],[$A$,$Systems design,None,$2],[$B$,$Subsystem A design,A$,1],[$C$,$Subsystem B design,A$,2],[$D$,$Subsystem C design,A$,1],[$E$,$Program A$,$B$,2],[$F$,$Program B$,$C$,10],[$G$,$Program C$,$D$,2],[$H$,$Subsystem A test,E$,1],[$I$,$Subsystem B test,F$,1],[$J$,$Subsystem C test,G$,1],[$K$,$Integration,H$,$ I, J$,2],[$L$,$Integration test,K$,1]]$

ABC Company prepare the project network for their upcoming project. How long will this project take to be completed?

$13$

$14$

$15$

$16$

$18$