The Minoan civilization flourished on the island of Crete around 2000

The Minoan civilization flourished on the island of Crete around 2000 B.C. The discovery on Crete of large numbers of bronze implements and the furnaces used in their manufacture shows that the Minoans had a thriving bronze industry. Moreover, many bronze artifacts from this period that are similar in style to those produced on Crete have been found in southern Greece. Hence it is probable that, besides making bronzeware for domestic use, the Minoans exported bronzeware to southern Greece.

Which of the following, if true, most strengthens the argument given?

Minoan (from Crete) craft bronze artifacts
such artifacts have been found on southern Greece, maybe the artifacts have been imported.
To strengthen the conclusion stating that such artifacts have been imported we can show that southern Greece's people had not suitable way to produce the artifacts at issue by themselves.

A. Copper and tin, the main ingredients of bronze, were present in Southern Greece.
No. Mildly weaken

B. No furnaces dating from the Minoan era and suitable for the manufacture of bronze implements have been found in southern Greece.
Correct. If southern Greece did not have suitable furnaces to craft implements, they must have imported the implements.

C. The Minoans exported a great deal of pottery, which was highly valued by other ancient civilizations.
No. We are discussing about Minoans exporte to southern Greece

D. The fuel needed for Minoan bronzeware furnaces was provided by a variety of local species of hardwood.
No. Out of scope

E. Some of the pieces of bronzeware found on Crete were non-Minoan in origin.
No. This tells us that import went on