Option D; as in CLA the carry is generated in parallel. Hence no concept of ripple carry.
Please refer to the carry equation
Where $Gi$ is the generator Function and $Pi$ is the propagation function.
$Gi$ = $AiBi$ (Ai,Bi are Bit pairs of the two n bit numbers)
$Pi$ = $Ai+Bi$ or $Ai ⊕ Bi$
Follow
CLA for further clarification.