Answer
(a) > (b) > (c)
Work Step by Step
When trying to find the pH of a solution, the concentration of the hydronium ion will help find the value of the pH. The greater concentration of Hydronium Ions, the more acidic the solution is. Beaker has the highest number of hydronium ions so it will have the lowest pH. Beaker b has the second highest number of hydronium ions so it will be the second highest pH. Finally, beaker c has the least number of Hydronium ions so it will have the least acidic solution.