Answer: Option (C) is the correct answer.
Step-by-step explanation:
A litmus paper is defined as a paper which helps in the detection of acidity or alkalinity of a solution.
When a solution is basic in nature then it is able to change the color of a red litmus paper into blue.
Whereas when a solution is acidic in nature then it is able to change the color of a blue litmus paper into red.
Therefore, we can conclude that when a strip of litmus paper is put into a solution and turns blue then it means the solution is basic.