Three test tubes A, B and C contain distilled water, an acidic solution and a basic solution respectively. When red litmus solution is used for testing these solutions, the observed colour changes respectively will be:

Options

A. A- no change, B-becomes dark red, C - becomes blue
B. A-becomes light red, B - becomes blue, C - becomes red
C. A-becomes red, B - no change, C - becomes blue
D. A- becomes light red, B - becomes dark red, C - becomes blue