Read the following article and answer the question by choosing from the options.

A few years before that , I had published a book about a political issue . An activist 's handbook . I had 20,000 copies in my garage when I found out about a large march in Washington . I bought an outdoor booth and trucked the books down to DC .

Why would the narrator be going to DC ?
Options are:
a). To see a concert .
b). None of the above choices .
c). To see the sights .
d). To take part in a march ....A:
d).