Final answer:
The character Sophie from the musical 'Mamma Mia' is reflected by the line, 'Mother says I was a dancer before I could walk'. This indicates her innate passion for music and dancing.
Step-by-step explanation:
The character that reflects the line, "Mother says I was a dancer before I could walk," is Sophie. This line is from the song 'Thank You For The Music' sung by Sophie in the musical and movie Mamma Mia. The character of Sophie is known for her love of music, which is a central theme in the story. Unlike the other options, Zazu and Scar are characters from The Lion King, and Harry does not correspond to the musical context of the question.