What is the least fraction to be added to the sum of the following fractions to make it an integer?
$$3\frac{1}{3}, 6\frac{11}{12}, 4\frac{7}{36}, 5\frac{1}{12}, 7\frac{1}{4}$$

A

$$\frac{7}{9}$$

B

$$\frac{5}{9}$$

C

$$\frac{2}{9}$$

D

$$\frac{1}{9}$$