Which describes a bubble? general downward trend in stock price general upward trend in stock prices major decrease in stock prices stock prices being higher than their real value

I would say stock prices being higher than their real value

Explanation:

A bubble is an economic cycle characterized by the rapid escalation of asset prices followed by a contraction. It is created by a surge in asset prices unwarranted by the fundamentals of the asset and driven by exuberant market behavior.

Bubbles in equities markets and economies cause resources to be transferred to areas of rapid growth. At the end of a bubble, resources are moved again, causing prices to deflate.