You have to remember the story in order to answer.That is what "reading comprehension"is all about.
Is there anything else that goes with this question?
Correct answer: C. faces like grotesque masks.
Explanations:
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.