Question - Isaac Asimov on science

Prompt:

The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' (I've found it!), but 'That's funny...' -Isaac Asimov.

Question:

In this quote, 'That's funny' refers to

A. Finding a solution
B. Discovering a problem
C. Developing a new theory
D. Abandoning an old hypothesis