In water, the mass ratio of hydrogen to oxygen is always 1:8.

The correct option is A

True

In water

Element	Atoms	Mass
Hydrogen	2 H	2$\times$1= 2 u
Oxygen	1 O	16 u

So, the mass ratio of hydrogen to oxygen is 2(1):16 = 1:8 in water. This will be the same irrespective of the source or method of formation.