Kant wrote:
"Good Will ... like a jewel ... would still shine by its own light,
as a thing which has its whole value in itself. Its usefulness or
fruitfulness can neither add nor take away from this value."
He must be understood as arguing that:
A
Following the correct maxim is right, regardless of any factual
condition.
B
Following the correct maxim is right - do not treat it as
a hypothetical imperative.
C
Both of the above