In Studying a Zinacantec Mayan Community in Mexico, Maynard and Greenfield

In studying a Zinacantec Mayan community in Mexico, Maynard and Greenfield (2003) found that the cultural practice of backstrap-loom weaving demonstrated:

A) traditional gender roles.
B) that adult looms were similar in complexity to toy looms.
C) that adult looms, but not toy looms, required concrete operational thinking.
D) that toy looms, but not adult looms, required concrete operational thinking.