Four combinations of two thin lenses are given in List `I`. The radius of curvature of all curved surfaces is `r` and the refractive index of all the lenses is `1.5` Match lens combinations in List `I` with their focal length in List `II` and select the correct answer using the code given below the lists.
(A) `(p) 2 r`
(B) `(q) ( r)/(2)`
( C) `(r) - r`
(D) `(s) r`.
Code :