B. Daniel progressively interpreted from the head to the feet. Passage of time represented from the head to the feet. Metals become more inferior as one progresses from head to the feet. . Quality of these kingdoms deteriorate with the passage of time. Man is not going to get better and better with time.
Metals grow stronger as they decline in value.
Atomic weights of metals decline. You are the head of Gold. Lion Kingdom 4. What we know from history, archeology. After thee shall arise another kingdom, inferior to thee.