Which of the following combinations is NOT possible?

Question

Options:

A . 2 experts in population studies from the Americas and 2 health experts from Africa attended the conference.

B . 2 experts in population studies from the Americas and 1 health expert from Africa Attended the conference.

C . 3 experts in refugee relocation from the Americas and 1 health expert from Africa attended the conference.

D . Africa and America each had only 1 expert in population studies attending the conference.

Answer: Option D
:
D

$\begin{matrix} A f r i c a & A m e r i c a & A u s t r a l i a & E u r o p e & T o t a l L a b o u r & 0 & 1 & 1 & 1 & 3 H e a l t h & 2 & 2 & 1 & 1 & 6 P S & 1 & 2 & 2 & 1 & 6 \frac{R e f u g e e}{A l l o c a t i o n} & 1 & 3 & 1 & 1 & 6 T o t a l & 4 & 8 & 5 & 4 & 21 \end{matrix}$
$\begin{matrix} A f r i c a & A m e r i c a & A u s t r a l i a & E u r o p e & T o t a l L a b o u r & 0 & 1 & 1 & 1 & 3 H e a l t h & 1 & 3 & 1 & 1 & 6 P S & 1 & 2 & 2 & 1 & 6 \frac{R e f u g e e}{A l l o c a t i o n} & 2 & 2 & 1 & 1 & 6 T o t a l & 4 & 8 & 5 & 4 & 21 \end{matrix}$
$\begin{matrix} A f r i c a & A m e r i c a & A u s t r a l i a & E u r o p e & T o t a l L a b o u r & 0 & 1 & 1 & 1 & 3 H e a l t h & 1 & 3 & 1 & 1 & 6 P S & 2 & 1 & 2 & 1 & 6 \frac{R e f u g e e}{A l l o c a t i o n} & 1 & 3 & 1 & 1 & 6 T o t a l & 4 & 8 & 5 & 4 & 21 \end{matrix}$