Improve the bracketed part of the sentence The ideology underlying racist practices (often includes the idea that human can be subdivided into) distinct groups that are different due to their social behaviour and their innate capacities as well as the idea that they can be ranked as inferior or superior.
Improve the bracketed part of the sentence The ideology underlying racist practices (often includes the idea that human can be subdivided into) distinct groups that are different due to their social behaviour and their innate capacities as well as the idea that they can be ranked as inferior or superior. Correct Answer Often includes the idea that humans can be subdivided into
The given sentence is in the present tense and phrase marked in bold- 'often include the idea that human can be subdivided into' is incorrect as 'include' is used with a plural noun whereas the word 'ideology' is a singular noun.
Also, the word 'human' used in the phrase is a singular noun, which is incorrect as one human cannot form a 'group'.
Hence, Option 4 will be the correct answer and can be used to improve the sentence.