The Burtons Are Selling Their Home Which Has Long Standing

The Burtons are selling their home which has long standing basement flooding problems which have damaged the foundation of the home.Before putting the home up for sale,they renovated the basement and the foundation crack is now behind a wall and cannot be seen.Which statement best describes the Burton's obligations toward potential buyers of the home?

A) They have no obligations to disclose anything to potential buyers.
B) They do not have to disclose the crack unless they are asked about the condition of the foundation.
C) They have a positive duty to disclose the hidden defect.
D) They have an ethical duty but not a legal duty to disclose the defect.