B

Reasoning: Living dental pulp is a loose connective tissue that contains collagen (type I and III/reticular) fibers and a rich plexus of mainly non-myelinated nerve fibers [Hillmann & Geurtsen, 1997, PMID 9182609; Henry et al., 2012, PMID 22429267]. Haversian fibers (components of the Haversian system of compact bone) are characteristic of bone, not of pulp tissue, and therefore are not present in a living pulp.