Answer:
This question is incomplete, there are no graphs but a general description that will help you to solve the problem is given below.
Step-by-step explanation:
A buffer is a solution composed by: a weak acid (or a weak base) and its salt. This kind of solutions have the capacity of maintain its pH without variations (or with very small variations) when small amounts of an acid or a base are added to it. So, if you are adding the same quantity of hydrochloric acid to different solutions (with the same volume), the one which experiences the lowest variations on pH will be the one with the biggest buffer capacity (greatest degree of buffering). On the contrary, the solution whic exhibits the highest variation on pH will be the one with lowest buffer capacity.