Solve the problem and enter your answer in the grid, as described below on the answer sheet. <br><br> If $2a = 3b$ and $5b = 3c$, what is the ratio of $a $ to $c$ ?

Question

$\begin{array}{1 1} (a)\; 10:9 \\ (b)\; 9:10 \\ (c)\; 8:7 \\ (d)\; 7:8 \end{array}$