What Does It Mean When Information in Long-Term Memory (LTM)is

What does it mean when information in long-term memory (LTM) is organized according to a clustering principle

A)  Words that look alike are grouped together in LTM. 
B)  Items that occurred close together in time are grouped together in LTM. 
C)  People create a network of nodes in LTM, with links to related concepts. 
D)  Related items tend to be remembered in groups or categories.