B: SYSDG administrative privilege has ability to perform Data Guard operations (including startup and shutdown) using Data Guard Broker or dgmgrl.
D: SYSASM The new (introduced in 11g) SYSASM role to manage the ASM instance, variable extent sizes to reduce shared pool usage, and the ability of an instance to read from a specific disk of a diskgroup
E (Not A): SYSDBA is like a role in the sense that it is granted, but SYSDBA is a special built-in
privilege to allow the DBA full control over the database
Incorrect:
Not C: SYSKM. SYSKM administrative privilege has ability to perform transparent data encryption
wallet operations.
Note:
Use the V$PWFILE_USERS view to see the users who have been granted administrative
privileges.

Explanation/Reference:
Explanation:
A (not B,not E): The CREATE DATABASE ... ENABLE PLUGGABLE DATABASE SQL statement creates
a new CDB. If you do not specify the ENABLE PLUGGABLE DATABASE clause, then the newly created
database is a non-CDB and can never contain PDBs.
D: You can create a PDB by plugging in a Non-CDB as a PDB.
The following graphic depicts the options for creating a PDB:

Incorrect:
Not E: For the duration of its existence, a database is either a CDB or a non-CDB. You cannot transform a
non-CDB into a CDB or vice versa. You must define a database as a CDB at creation, and then create
PDBs within this CDB.

REVOKE ..FROM
If the current container is the root:
/ Specify CONTAINER = CURRENT to revoke a locally granted system privilege, object privilege, or role from a common
user or common role. The privilege or role is revoked from the user or role only in the root. This clause does not
revoke privileges granted with CONTAINER = ALL.
/ Specify CONTAINER = ALL to revoke a commonly granted system privilege, object privilege on a common object, or
role from a common user or common role. The privilege or role is revoked from the user or role across the entire CDB.
This clause can revoke only a privilege or role granted with CONTAINER = ALL from the specified common user or
common role. This clause does not revoke privileges granted locally with CONTAINER = CURRENT. However, any
locally granted privileges that depend on the commonly granted privilege being revoked are also revoked.
If you omit this clause, then CONTAINER = CURRENT is the default.
References: