Broker K arrives to present an offer to Mrs. G, an invalid, and finds her son and his wife also present. Both individuals persistently urge Mrs. G to accept the offer on her home, though it is much lower than the price she was asking. If Mrs. G signs the offer, she may later claim:

that Broker K should not have brought her a low offer

that she was under undo duress from her son and daughter-in-law and that the agreement is voidable

that Broker K defrauded her by allowing her son and daughter-in-law to see the agreement

that her son and his wife have usurped her consumer protection rights
A: that she was under undo duress from her son and daughter-in-law and that the agreement is voidable

Because she is an invalid, and her son and daughter-in-law persisted in their efforts to have Mrs. G sign the terms of the contract. (Under duress)