On which objects are the feed-based layout available?

Answer options:

A.Case
B.Account
C.Asset
D.All the above

Correct Answer: D 
The feed-based layout is available for the account, asset, case, contact, lead, opportunity and custom, and external objects. 
Reference:

https://help.salesforce.com/articleView?id=feed_based_layouts_overview.htm&type=5