Which of the following package feed permissions should be given to the team leads?

Answer options:

A.Collaborator
B.Contributor
C.Owner
D.Reader

Answer – C 
You would need to give Owner privileges so that the team members could edit the feed permissions. 
Below is the list of permissions given in the Microsoft documentation. 

Since this is clearly given in the Microsoft documentation, all other options are incorrect. 
For more information on feed permissions, please visit the following URL- 

https://docs.microsoft.com/en-us/azure/devops/artifacts/feeds/feed-permissions?view=azure-devops