I am having trouble with this question:

Consider the following three scenarios:

(i) 2.3 g of pure Na2CO3 reacts completely with a certain volume, V1, of 0.1 mol L–1 hydrochloric acid to give sodium chloride, carbon dioxide and water.

(ii) 2.3 g of a sample containing Na2CO3 but also contaminated with some K2CO3, similarly reacts completely with a certain volume, V2, of 0.1 mol L–1 hydrochloric acid.

(iii) 2.3 g of a sample containing Na2CO3 but contaminated with some NaOH, similarly reacts completely with a certain volume, V3, of 0.1 mol L–1 hydrochloric acid.

What is the relationship between the volumes V1, V2 and V3?

A) V3>V1>V2

B) V1>V2>V3

C) V3>V2>V1

D) V1>V3>V2

E) V2>V3>V1

What do they mean by "the relationship between volumes"? How does one go about solving this question? I came up with the balanced equations for all three of the scenarios but am confused as to how much a certain volume of HCl can increase/decrease in a given reaction.

Help with solving the problem would be greatly appreciated!