Final answer:
Malú may assume Ellie likes music due to behavioral cues or interactions indicating a common interest, as music is often portrayed as a universal language connected with emotions and personal expression.
Step-by-step explanation:
Malú may have assumed that Ellie liked music based on observations of her behavior or previous interactions that suggested a shared interest in music. This assumption could stem from a number of portrayals of characters in literature and film who express emotions, connections, or ideas through musical elements. In the provided texts, we see examples of how music is intertwined with emotions, storytelling, and human connection, which implies that a love for music can be a common trait among individuals. Characters such as McTeague, who expresses his sentiments directly and a student captivated by the dance of his love influenced by music, or Bibi, who incorporates music into her daily life, highlight how music can be a form of communication and an expression of one's self.