An imperialist attitude is an attitude which places the British Empire as superior to any other civilizations. It encourages colonialism (making other countries submit to their rule and taking slaves - e.g. the African continent) and racism.
To imperialists, there are superior and inferior civilizations. People of color are among the inferior civilizations. Because Joseph Conrad held this view, he wrote that the faces of those “black fellows” were like grotesque masks. He thought this because of their color.
Nowadays, imperialist and racist views are condemned. Values such as respect for human rights, freedom and democracy are widely spread and promoted by scholars.
This answer mostly depends on the citation style you are using and is required of you. Out of all the possible answer provided the correct answer here would be A. (Slurry 110). This according to MLA style of citation would be a correct way to cite the author for the in text citation.