When acid is added to a basic solution, universal indicator changes from blue to green. What is the conclusion?

Correct answer: The solution became nearly neutral

The governing concept is acid–base neutralisation shown through pH colour changes. Blue indicates a basic solution, whereas green is characteristic of a nearly neutral solution around pH 7. Adding acid consumes some hydroxide ions and lowers the basicity, so the mixture approaches neutrality. Hence option A is correct. It did not become more basic, strongly acidic, or unchanged as the distractors claim.