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Why was the Altamira Cave's authenticity questioned for so long?

At first, the authenticity of the paintings were questioned because they were in such amazing shape. No one could believe that paintings made of such organic materials could be preserved for so long.

At first, the authenticity of the paintings were questioned because of the amount of painting produced. No one could believe that paintings would be able to be created at a large quantity in that time period.

At first, the authenticity of the paintings were questioned because of the large amount of color used. No one could believe that the vibrant colors in the paintings were accessible during that time period.

At first, the authenticity of the paintings were questioned because they were in such poor shape. No one could believe that paintings made of such organic materials would fail to be preserved over time.