Two converging lenses, of the same size and shape, are held in sunlight, the same distance above

Question:

Two converging lenses, of the same size and shape, are held in sunlight, the same distance above a sheet of paper. The figure shows the paths of some rays through the two lenses. Which lens is made of material with a higher index of refraction? How do you know?
(a) Lens 1, because its focal length is smaller
(b) Lens 1, because its focal length is greater
(c) Lens 2, because its focal length is smaller

(d) Lens 2, because its focal length is greater

(e) Impossible to answer with the information given