Scholars Had Almost No Jewish Literature Dating from the Centuries

Scholars had almost no Jewish literature dating from the centuries immediately before or during the formative period of Christianity until

A) the discovery of parchment fragments in Syria,which still have not been translated.
B) the Dead Sea Scrolls were found in 1947.
C) Rabbi Shammai's death,and with it the exposure of several scrolls of that period that he had kept secluded.
D) the Mt.Zion Papers were dug up at the base of Mt Zion.