For years, scholars studying the earliest Mesoamerican

For years, scholars studying the earliest Mesoamerican writings operated under the assumption that the most ancient form of these writings is the script known as La Mojarra. This script was discovered on several ancient artifacts, the most famous is La Mojarra Stela, a tablet which dates from approximately 150 A.D. However, after the excavation of the Zapotec monuments in the valleys of Oaxaca in 1992, the oldest Mesoamerican writing is now believed to be that of the Zapotecs, who it has been determined were using a system of hieroglyphs and a bar and dot system of numerals as early as 600 B.C. to document the reigns of their kings.

Which of the following discoveries, if true, most substantially weakens the conclusion above?

(A) Writing tablets from the Mayan empire near Oaxaca are discovered which document preliminary building plans for a tomb containing bodily remains and date back to 800 B.C.
(B) The inscription on a cracked tablet, in a previously unidentified script, is discovered to describe events that pre-date the founding of the Zapotec Civilization.
(C) The religious icons worshipped by the Zapotec are discovered to share mythological origins with deities described in La Mojarra Stela.
(D) Subsequent analyses of the glyphs on La Mojarra Stela show that they are most likely derivations of those inscribed on the Zapotec Monuments.
(E) The violence that typically accompanied regime changes in the Zapotec empire led to the destruction of many artifacts including tablets and decorative carvings.