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The discovered artifacts could float.

If the discovered artifacts could float, it would suggest that early humans did not necessarily need to construct water transport to reach Flores. This alternative explanation could account for the presence of the artifacts without requiring advanced technology or language capabilities for a seagoing voyage.

A) Early humans could swim.

While this option suggests that early humans might have been capable swimmers, it does not directly address the presence of the artifacts found on Flores. Swimming alone would not explain how the artifacts arrived if they were not carried by the individuals, nor does it negate the need for water transport.

B) The discovered artifacts could float.

This option provides a plausible alternative explanation for the artifacts' presence without needing to invoke the advanced technological capabilities of early humans. If the artifacts could float, they might have simply drifted to Flores, eliminating the need for seafaring skills or the construction of water transport.

C) Materials to construct water transport were not available on Flores.

This option is incorrect as it implies that the absence of materials would prevent the construction of water transport. However, it does not provide an alternative explanation for how the artifacts arrived since it does not account for the possibility of floating artifacts.

D) Early humans were using tools more than one million years ago.

While this option suggests an advanced level of tool use, it does not offer a clear alternative explanation for how the artifacts reached Flores. It simply reinforces the notion of their capabilities rather than providing a different scenario for the artifacts' presence.

E) The discovered artifacts were made by more than one person.

This choice does not provide a distinct alternative explanation for the artifacts' arrival on Flores. It merely suggests collaborative creation, which does not address the transportation issue or negate the need for advanced water travel capabilities.

Conclusion

The option that states the discovered artifacts could float offers the most compelling alternative explanation for their presence on Flores. It sidesteps the necessity for advanced technology or language, which would be required for a seafaring journey. Other options either reinforce the need for such capabilities or fail to provide a viable alternative scenario.