An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?
A. Base - Weak, Acid - Strong, End point - Yellow to pinkish red
B. Base - Strong, Acid - Strong, End point - Pink to colourless
C. Base - Weak, Acid - Strong, End point - Colourless to pink
D. Base - Strong, Acid - Strong, End point - Pinkish red to yellow