Choose a for the second one. . Because utopian socialism also criticizes capitalism. . Scientific socialism also criticizes capitalism. . . But they have different ways to realize socialism. . Utopian socialism advocates the realization of socialism by moderate methods. Some people will pay to build a small socialist community and attract some proletarians or volunteers to work and live in this community. Then slowly expand this community and finally realize socialism in the whole society or the whole country. Scientific socialism advocates the establishment of socialism through violent revolution. First, overthrow the bourgeois regime and establish the proletarian regime, and then establish socialism under the protection of the proletarian regime.