$\backslash$table$[[$Activity$,$Predecessor,$\backslash$table$[[$Estimate$],[$in weeks$]]],[$Start$,-,0],[$C$,$Start,$6],[$B$,$Start,$4],[$P$,$Start,$3],[$A$,$C$,$ B$,$ P$,7],[$U$,$P$,4],[$T$,$A$,2],[$R$,$A$,3],[$N$,$U$,6],[$End$,$T$,$ R$,$ N$,0]]$

$*$Source citation: RMC Project Management, Inc. $(2013)$

What is the duration of the critical path?

$7$ weeks

$18$ weeks

$16$ weeks

$15$ weeks