Answer:
A. 30 kg
Explanation:
As we know that,
[tex]1 litre=1000cm^{3}[/tex]
And 1 litre is equivalent to 1kg.
Given that, The volume of the rectangular container is,
[tex]V=20cm\times 30cm\times 50cm\\V=30000cm^{3}[/tex]
And this volume will be equal to [tex]V=30000cm^{3}=30litres[/tex]
And this litres in kg will be equal to,
[tex]V=30litres=30 kg[/tex]
Therefore the mass of this volume of water is 30 kg.