The ratio of milk to total volume of the mixture in the 3 vessels is
\(\frac{8}{9}\), \(\frac{1}{6}\) and \(\frac{1}{2}\) .
By this, we get the ratio in which the two mixtures are mixed as 6:7.
Since the total quantity is 26, the quantity from the 2nd vessel will be
(\(\frac{7}{13}\)) × 26 = 14 gallons
The correct option is (B)