Evidence for the Impact That Occurred near Chicxulub,Mexico,includes All but Which

Multiple Choice

Evidence for the impact that occurred near Chicxulub,Mexico,includes all but which of the following?

A) quartz grains with shocked crystal structures,indicating a short and violent impact
B) iridium anomaly at roughly 100 sites worldwide in a thin layer of rock 65 million years old
C) sand-sized spherules of minerals suggesting a melting and resolidification of rock
D) large pieces of meteorite found in Mexico
E) The K/T boundary clays have a different composition from clays in the limestone layers above and below it;they might be explained by a mixture of one part asteroid to ten parts Earth crust