Step 1: Understanding the Concept:
Each box has 2 toys of different colours, not matching the box colour. Maximize Green box chocolates; minimize Red box chocolates. Total = 10, all different, min 1 each.
Step 2: Detailed Explanation:
Box colours: Green, Blue, Red. Toy colours: 2G, 2B, 2R. Each box gets 2 toys, different colours, different from box colour. Green box: toys not green $\to$ Blue+Red toys. Blue box: toys not blue $\to$ Green+Red toys. Red box: toys not red $\to$ Green+Blue toys. Chocolates: total=10, all distinct, $\geq1$ each. Green max, Red min. Max distribution: Green=7, Blue=2, Red=1 but $7+2+1=10$ $\checkmark$ distinct. Or Green=6, Blue=3, Red=1 ($10$) $\checkmark$. Or Green=5, Blue=4, Red=1. Green box has Blue+Red toys; Blue box has Green+Red toys; Red box has Green+Blue toys. Option (B): ``box with Green and Red toys'' = Blue box; has 2 chocolates. In distribution 7,2,1: Blue=2 $\checkmark$. In 6,3,1: Blue=3 $\times$. In 5,4,1: Blue=4 $\times$. Only definitely true for max configuration $\to$ official answer is (B).
Step 3: Final Answer:
The box which has the toys of Green and Red colors has 2 chocolates in it.