With Respect to Co-Ownership of Real Estate,which of the Following

With respect to co-ownership of real estate,which of the following distinguishes an undivided one-half interest held in a tenancy in common from an one-half interest held in a joint tenancy?

A) Each owns an undivided co-ownership of the whole.
B) Each owns an undivided co-ownership of each portion.
C) Each owns an undivided interest in ownership of the whole.
D) Each owns an undivided interest in ownership of their portion.