6. Given that the sum of the prices of 6 roses and 3 carnations is greater than 24 yuan, and the sum of the prices of 4 roses and 5 carnations is less than 22 yuan. Then the comparison result of the price of 2 roses and the price of 3 carnations is
A. The price of 2 roses is higher
B. The price of 3 carnations is higher
C. The prices are the same
D. Uncertain
Let the price of 1 rose be $x$ dollars, and the price of 1 carnation be $y$ dollars, then we have
$$
\begin{array}{l}
\left\{\begin{array}{l}
u=6 x+3 y>24, \\
v=4 x+5 y\frac{11}{9} \times 24-\frac{4}{3} \times 22=0\right.\right.
\end{array}
$$
$\Rightarrow 2 x-3 y>0$. That is, the price of 2 roses is higher, so the answer is $A$.