Final answer:
Sanju had a magic pencil on the television show, which is not listed among the provided options. This pencil had the ability to alter reality, which fascinated Malala.
Step-by-step explanation:
The magical object that the character Sanju had on Malala's favorite childhood television show was a magic pencil. This is not mentioned in the options provided in your question. Malala talks about this show in her book 'I Am Malala', where she explains that Sanju could use his magic pencil to make things happen, like erasing people or drawing a lock on his door. Unfortunately, the choices given a) Magic wand b) Flying carpet c) Invisibility cloak d) Talking mirror do not accurately represent the magical item Sanju possessed.