A jar full of whisky contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohol and now the percentage of alcohol was found to be 26%. What quantity of whisky is replaced ?

A

$$\frac{2}{3}$$

B

$$\frac{1}{3}$$

C

$$\frac{3}{7}$$

D

$$\frac{4}{7}$$