A deed contains a restrictive covenant barring the sale of the land to persons of non-Caucasian descent. This covenant:

A. is enforceable only as long as the grantor remains living
B. may be enforced by the grantee
C. is unenforceable but does not invalidate the conveyance
D. is illegal and invalidates the conveyance

Answer: C. is unenforceable but does not invalidate the conveyance
Explanation: The covenant is unenforceable, but the deed otherwise remains valid.