Answer: Option (a) is the correct answer.
Step-by-step explanation:
A solution with pH value more than 7 will be basic in nature and hence it will have more number of hydroxide ions.
Whereas a solution with pH value less than 7 will be acidic in nature and hence, it will have more number of hydrogen or hydronium ions.
On the other hand, a solution with pH equal to 7 will be neutral in nature as it will neither have hydrogen ions or hydroxide ions.
Thus, we can conclude that a solution is measured to have a pH of 2.3 would most likely be has a low hydroxide ion concentration.