These Features Are Common to All Connective Tissues Except

These features are common to all connective tissues except

A) most cells are not in direct contact with each other.
B) interstitial fluid is so scarce that it is not visible with a light microscope.
C) cells usually occupy less space than extracellular material.
D) protein fibers are usually present in the ground substance.
E) most of them are highly vascular.