At a loading dock, each worker on the night crew loaded 3/4 as many boxes as each worker on the day crew. If the night crew has 4/9 as many workers as the day crew, what fraction of all the boxes loaded by the two crews did the day crew load?	Choose the most appropriate option:
A) 1 / 2  B) 2 / 5  C) 3 / 4  D) 4 / 5  E) 5 / 8

Rationale: "method : x = no . of boxes loaded by day crew . boxes by night crew = 3 / 4 * 4 / 9 x = 1 / 3 x % loaded by day crew = x / ( x + 1 / 3 x ) = 3 / 4 answer c"
Answer: C