Jason Whitesides Passed Away with a Will That Awarded His

Jason Whitesides passed away with a will that awarded his estate to his children or grandchildren if his children predecease him. The will directs a per capita distribution. Jason has three children, Joan, John and James. However, James died one year before Jason. James is survived by two children, Jack and Jane. How is the estate to be distributed?

A) Joan - 1/3, John - 1/3, Jack - 1/6, Jane 1/6
B) Joan - 1/4, John - 1/4, Jack - 1/4, Jane - 1/4
C) Joan and John - 1/2 each
D) James does not inherit, so neither do his children