During the first millennium b. c.e.:
a. bronze slowly replaced iron as the primary component of tools and weapons.
b. iron slowly replaced bronze as the primary component of tools and weapons.
c. tempered copper slowly replaced bronze as the primary component of tools and weapons.
d. scholars from india to ireland used the sanskrit language in academic treatises.

Option B.

Explanation:

The first millenium BC saw the birth of the Iron Age in Europe, Asia and Africa. Thus, iron slowly replaced bronze as the primary component of tools and weapons, and seeing the birth of classical antiquity in Greece, the unification of China, the birth of the Yamato culture in Japan, and the rise of the Persian Empire.

b. iron slowly replaced bronze as the primary component of tools and weapons.

well this isn't a question but if you are asking if it is true or false it is, true.

what is the question?