What Was Determined in the Studies by Cowan and Colleagues

What was determined in the studies by Cowan and colleagues (1999) assessing the span of apprehension?

A) Average span of apprehension was about 3.5 digits for adults, about 3 digits for fourth-graders, and about 2.5 digits for first-grade children.
B) Average span of apprehension was about 7.5 digits for adults, about 6 digits for fourth-grades and about 4.5 digits for first-grade children.
C) Average span of apprehension was equal for both adults and fourth-graders but almost nil for first-grade children.
D) Average span of apprehension could not be determined given the limited resources to assess for apprehension in first-grade children.