The given answer is C. (Composite Pattern).
The exam covers the foll. patterns:
http://www.sun.com/training/catalog/courses/CX-310-081.xml Section 11:
J2EE Patterns
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Given a scenario description with a list of issues, select a pattern that would solve the issues. The list of patterns you must know are: Intercepting Filter, Model-View-Controller, Front Controller, Service Locator, Business Delegate, and Transfer Object.
Match design patterns with statements describing potential benefits that accrue from the use of the pattern, for any of the following patterns: Intercepting Filter, Model-View-Controller, Front Controller, Service Locator, Business Delegate, and Transfer Object.