The true statement about Great American Songbook is that Ella Fitzgerald was one of the primary contributors to it.
This songbook acts as a canon of the most important and influential American popular songs and jazz standards from the early 20th century that have stood the test of time in their life and legacy.
Hence, the true statement about Great American Songbook is that Ella Fitzgerald was one of the primary contributors to it.
Therefore, the Option D is correct.
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