Which choice most logically completes the text?

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The single origin hypothesis of iron metallurgy posits that the craft originated in Anatolia (West Asia) circa 2200-2000 BCE before diffusing to other parts of the world, including Africa. Some proponents of the hypothesis argue that iron production technologies first arrived in North Africa through Carthage, where the earliest evidence of ironworking dates to approximately 800-600 BCE, before these technologies spread to sub-Saharan Africa over the following centuries. However, excavation of multiple sites on the Adamawa plateau in Central Africa conducted by Étienne Zangato and Augustin Holl uncovered evidence of iron workshops that may have been in operation as late as 900-750 BCE in Gbabari and as early as 2300-1900 BCE in Ôboui and Gbatoro. These findings suggest that ____

iron production may have originated in Anatolia much earlier than the available evidence currently indicates.

iron production technologies were likely transmitted from Anatolia to Central Africa via an alternate route than the one suggested by some proponents of the single origin hypothesis.

iron production technologies found in Gbabari likely derived directly from technologies transmitted from Anatolia, but those found in Ôboui and Gbatoro did not.

iron production may have developed independently and relatively simultaneously in Anatolia and parts of Central Africa.