Answer: First, we must add the options:
a. Eleanor will not be liable, because most people would not know that the painting was by Thomas Gainsborough.
b. Eleanor will not be liable as long as she can prove that Aziz did not know the painting was valuable when he bought it.
c. Eleanor will be liable if Irene can prove that all appraisers would recognize the painting as being valuable.
d. Eleanor will be liable if Irene can prove that the best appraisers would know that the painting was by Thomas Gainsborough
The correct option is C.
Explanation: This result will depend on whether Irene can prove beyond reasonable doubt, that all art appraisers, on seeing the painting would be able to recognize it as priceless or valuable.
If Irene can prove this, then Eleanor will be liable.