A Chemistry Student Measures the PH of a Solution as 7.1.The

A chemistry student measures the pH of a solution as 7.1.The student adds five milliliters of an acid to the solution and finds that the pH of the solution is still 7.1.What conclusion could be made from these observations?

A) The original solution was weakly basic.
B) The original solution was weakly acidic.
C) The original solution was strongly basiC.
D) The original solution was buffereD.
E) The original solution was strongly acidic.