How is it possible to ensure that the same set of nameservers can be used for multiple hosted zones in Route53?

Answer options:

A.This is not possible
B.In the API, create a Reusable Delegation Set.
C.In the console, create a Reusable Delegation Set.
D.Import the domain in Route53

Answer – B
The AWS Documentation mentions the following
Creates a delegation set (a group of four name servers) that can be reused by multiple hosted zones. If a hosted zoned ID is specified, CreateReusableDelegationSet marks the delegation set associated with that zone as reusable
For more information on CreateReusableDelegationSetplease see the below link:
http://docs.aws.amazon.com/Route53/latest/APIReference/API_CreateReusableDelegationSet.html