3. Understanding in science means that a. we have accumulated lots of facts.
b. we can connect facts through an underlying idea.
c. we can predict events on the basis of accumulated facts.
d. we can predict events on the basis of an underlying idea.

Option B

Explanation:

In simple words, understanding in science relates to the process in which a researcher or learner is able to connect different facts collected from different idea on the basis of a phenomenon that can be proven with respect to absolute and rigid reality.

Just a mere collection of fact cannot be termed as idea and the prediction of an event that has previously been proven is an experiment and not understanding. Thus, the correct option is B .