On what policy did william jennings bryan base his candidacy for president?

Bryan was a candidate for the presidency of the United States of America on three occasions: in 1896, 1900 and 1908. In all these presidential elections he was defeated by the candidates of the Republican Party, first by William McKinley (veteran of the Civil War), and then by William Taft.

The presidential campaigns of Bryan were extremely striking, because in all the occasions that he presented his candidacy he maintained a high popular support thanks to doctrines and ideas that were supported by a broad social strata. Bryan held openly populist ideas stemming from his alliance with the People's Party, and decisively influenced the Democratic Party to abandon laissez-faire principles and partly embrace state interventionism, under the "free silver" slogan. Meanwhile, he warned that the growing industrialization of the United States motivated that great masses of individuals of the proletariat and the middle classes were interested in protecting their interests in national politics.

the correct answer is

d) rocket launcher