One of the consequences of advanced cognitive ability has been the emergence of cultural life.

A．many
B．much
C．deeply
D．profoundly

A．how historians ought to explain the origins of the conditions in the Chicago meat-packing industry
B．why it is difficult to determine the actual nature of the conditions in the Chicago meat-packing industry
C．why a particular account of the conditions in the Chicago meat-packing industry is inaccurate
D．what ought to be included in any account of the Chicago meat-packers’ role in the national labor movement