Answer:
A. Connecting the past and present
Step-by-step explanation:
The historical skill that does the most to help people avoid or solve problems is "Connecting the past and present."
This is because our connecting our experiences of the past events would make us make better choices in the present.
Trying to apply what works for us in the past to solve the present problems, or avoiding our actions and inactions in the past events to understand the current events is a means of "connecting the past and present."