Answer: The options that are colloquialisms are "cupcake", "folks" and "lab".
Explanation: Colloquialisms are words or phrases used in an informal context, that is to say during an ordinary conversation. "Cupcake", which is used to refer to a small cake or to a young woman considered to be attractive, is an informal word. Moreover, "folks" would also be part of an informal context since it is a colloquial form of saying "people". Finally, "lab" is also a colloquialism because it is an abbreviation of the word "laboratory".
