This indicator becomes colored when the solution is no longer acidic.
select all the apply to the indicator phenolphthalein.
is pink in acid solution.
it provides a visual signal that a solution has changed from acid to a base.
is pink in base solution.
is colorless in acid solution.
is colorless in base solution.

Is pink in base solution, it provides a visual signal that a solution has changed from acid to a base, is colorless in acid solution.

Explanation:

As all the indicator, phenolphtalein has the property that turns pink when the solution that you have reaches a value of a pH of 9 or above. From 0 to 8 in a pH scale, is colorless. This point in which an indicator changes is it called equivalence point.

the correct answer would be d. hope this !