D is the answer, I believe.
An isolated system is one that allows neither heat or matter to enter or exit, and since the liquid remained the same temperature, one can conclude that neither energy nor matter is passing through.
The mathematical expression is given as:
(1)
where,
= depression in freezing point
= molal freezing point.
Now, first calculate the 

Substitute the values in equation (1), we get

=
or 
Now,
In 0.1 moles of water = 1 kg of butanol
So, 11.9 g of butanol = 
Convert gram into kilogram, (1 kg =1000 g)
= 
= 
Mass of water present in sample = 
=
Hence, grams of water present in the sample =
Because matter makes up everything and without matter nothing would exist :)
Row: similarity in properties.
Column: Arrange according to the elements' masses and valency.