In the diagram of human eye given below, the parts marked by A, B, C and D should be labelled as
1
A - ciliary muscle, B - pupil, C - lens, D - cornea
2
A - iris, B - pupil, C - lens, D - cornea
3
A - iris, B - cornea, C - pupil, D - lens
4
A - ciliary muscle, B - iris, C - lens, D - cornea