1.

1). Only III2). Only II3). Both II and III4). Only I

Answer»

The error lies in the I part of the sentence. The noun 'pioneer’ which means ‘a person who is AMONG the first to explore or settle a new country or area’ should be replaced with the adjective 'PIONEERING’ which means ‘involving new ideas or METHODS.’$

Correct sentence: A set of pioneering studies a generation AGO found that African American children shown black and WHITE dolls preferred white dolls over the black ones.$

Hence the correct answer is option 4.



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