Raju and Lalitha originally had marbles in the ratio 4:9. Then Lalitha gave some of her marbles to Raju. As a result, the ratio of the number of marbles with Raju to that with Lalitha became 5:6. What fraction of her original number of marbles was given by Lalitha to Raju?

A

$$\frac{1}{5}$$

B

$$\frac{6}{19}$$

C

$$\frac{1}{4}$$

D

$$\frac{7}{33}$$