Answer: B

Explanation: A HybridDictionary is implemented as a
ListDictionary for small
collections and a Hashtable for large collections. Hence it
provides very efficient
storage for both small and large collections.
OrderedDictionary supports sorting based on the key. It has
similar disadvantages for
small collections to Hashtable on which it is based.
ListDictionary is ideal for small collections because it is
implemented as a light-weight
linked list. Performance will suffer for large collections.
HashTable is ideal for large collections, for small
collections the overheads of such a
sophisticated data structure do not compensate for the benefits