Which system objects should you use in your query to best achieve this task?

You administer a SQL Server 2014 instance.
Users report that the SQL Server has seemed slow today. A large database was being restored for much of the day, which could be causing issues.
You want to write a query of the system views that will report the following:
. Number of users that have a connection to the server
. Whether a user’s connection is active
. Whether any connections are blocked
. What queries are being executed
Whether the database restore is still executing and, if it is, what percentage of the restore is complete.
Which system objects should you use in your query to best achieve this task?
A. sys.dm_exec_requests, sys.dm_exec_sessions, sys.objects
B. sys.dm_exec_sessions, sys.dm_exec_query_stats, sys.dm_exec_query_text,sys.objects
C. sys.sysprocesses, sys.dm_exec_query_text, sys.objects
D. sys.dm_exec_requests, sys.dm_exec_sessions, sys.dm_exec_query_text