If the $2^{nd},5^{th}$ and $9^{th}$ terms of a non-constant A.P. are in G.P., then the common ratio of this G.P. is:

Question

$\begin{array}{1 1}(1) \large\frac{8}{5} \\(2) \large\frac{4}{3} \\ (3) 1 \\ (4) \large\frac{7}{4} \end{array}$