Among the boxes, A, B, C, D and E. B is twice as heavy as A. C is 20 kg heavier than E. D is one and a half times as heavy as E, and C is four times as heavy as A. The weight of E is 20 kg. Which object is the heaviest of all. and what is its weight ?

1. C, 60 kg

2. D, 60 kg

3. D, 40 kg

4. C, 40 kg