At a local office, each trainee can stuff \(\frac23\) as many envelopes per day as a full-time worker. If there are

At a local office, each trainee can stuff \(\frac23\) as many envelopes per day as a full-time worker. If there are \(\frac25\) as many trainees as there are full-time workers, then what fraction of all the envelopes stuffed in a day did the trainees stuff?

A. \(\dfrac2{19}\)
B. \(\dfrac2{17}\)
C. \(\dfrac4{19}\)
D. \(\dfrac4{17}\)
E. \(\dfrac{14}{15}\)

[spoiler]OA=C[/spoiler]

Source: Princeton Review