How does the explanation of the origin of the term “alter ego” explain its later use in popular culture and literature?

The meaning of the term is "other I"  in latin an refers to a second part or identity that is contrary to the one that is commonly known.

Explanation:

The phrase "alter ego" comes from latin and means "other I".  It was used in Rome by phiposopher Cicero to describe another part of himself. Later on the term would be used for different psychologists to refer to different personality disorders. Eventually, the term became popular enough to be used by artists creating literature based on that concept , for example,  the tale of Dr. Jeckyll and Mr. Hyde.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b