A) a poor driving attitude
13.5 g ---> 1 cm3
50.0 g ---> ?? cm3
?? = (50.0 * 1 ) / 13.5 = 3.704 cm3
The mercury would occupy 3.704 cm3
I think the correct answer would be that there are a relatively small number of moles of HCl present. Dilute would mean that there are very few solute particles dissolved as compared to the solvent particles in the solution. Hope this helps.