A hypothetical example is:

A. A false example
B. not real but can happen
C. an example to prove a hypothesis
d. has no place ina speech

http://www.boundless.com/communications/supporting-your-ideas/using-examples/types-of-examples-brief-extended-hypothetical/

A hypothetical example is an example that is not based on real events or facts but is used to illustrate a point, idea, or concept. It could be a possible scenario or situation that helps to explain or explore a particular idea. The purpose of using a hypothetical example is to provide a clear illustration or demonstration of a concept or theory. It is not meant to be a definitive or factual representation but rather a tool for understanding and analysis.

So, the correct answer would be:

B. not real but can happen