oye yaar...........u are assured that the answer is c) iff and only iff the lens is just covered and not seperated...

so u cud have a check at the question another time if u want to.........ive seen many such Q.s yaar.........a similar or say the same Q. in fiitjee and the answer was c) only.......( i mean not c of those options but the answer that c means in ur list of options).......so jus. relax..........