$$20$ is to be divided among two individuals$$Gary and Jamie. Which of the following allocations is NOT Pareto efficient?

A$)$

Gary receives $$19,$ and Jamie receives $$1.$

B$)$

Gary receives $$1,$ and Jamie receives $$19.$

C$)$

Gary receives $$8,$ and Jamie receives $$9.$

D$)$

Gary receives $$15,$ and Jamie receives $$5.$