Answer:
Solution A has the greater concentration of hydronium ions. That solution is 100 times more concentrated than the other solution.
Explanation:
For solution A take 10^-pH in this case 10^-2=.01
For solution B you would take 10^-4=.0001
.01>.0001 so solution A is more concentrated with H^+
To figure out how much more concentrated one solution is than the other:
(10^-2)/(10^-4)