Final answer:
Being labeled a 'cold fish' means someone is described as indifferent and unemotional.
Step-by-step explanation:
When someone is labeled a 'cold fish,' it means they are described as indifferent and unemotional (option b). A 'cold fish' is someone who lacks warmth, emotion, and enthusiasm in their interactions with others. They may appear distant, reserved, and unmoved by emotional situations. This term is often used to describe someone who is not very expressive or engaging in social interactions.