A ! The body provides oxygen and nourishment etc etc
Are you serious? Is this a 'trick' question? You don't know that silica has density greater than water? Trick Question....
I'm beginning to 'wonder' about this site. I'll bet you're stood-up by an ABC-Agency.
Who would ask kids this kind of question?
Info-miner's or 'profilers'!
It’s not A , it’s not D, I am pretty sure that it’s B.
I hope this helps!