I've got to the position___hard workby this means by no means by all means by means of 选哪个

I've got to the position___hard workby this means by no means by all means by means of 选哪个
I've got to the position___hard work
by this means by no means by all means by means of 选哪个

I've got to the position___hard workby this means by no means by all means by means of 选哪个
选D, by means of 经,由,通过某种方式
我是通过自己的努力猜到达这个位置的
（A 通过这种方式,B绝不,C无论如何）

by means of