Passage Summary: Historians believe books are the number one source for history and don't think art or dance is the number one source; therefore, the author claims historians are ignoring those other sources.

Conclusion: Historians fail to give proper attention to various important sources of historical information, such as art and music.

Reasoning: Historians generally rank written texts as the single best source for understanding history and do not rank arts or music as the best source.

Analysis: The argument suffers from a major 'all-or-nothing' leap. It assumes that if historians don't consider something the *best* source, they must be neglecting it entirely. This ignores the very likely possibility that historians use written texts primarily while still heavily utilizing and valuing art, music, and architecture as secondary sources. You should look for an answer choice that highlights this gap between ranking something as top priority and ignoring everything else.