Explanation/Reference:
A: When using the create command with WLST online you must be connected to an Administration Server.
B: Child types must be created under an instance of their parent type.
C: Syntax: create(name, childMBeanType, [baseProviderType])
The Create command creates a configuration bean of the specified type for the current bean.
Incorrect Answers:
D: The create command returns a stub for the newly created configuration bean. It can't create a runtime management bean.
E: The create command returns a stub for the newly created configuration bean.
Reference: https://docs.oracle.com/cd/E13222_01/wls/docs92/config_scripting/reference.html#wp1081543