Select the set of classes the relationship among which is best represented by the following Venn diagram.
Students, Part-time workers, Girls
The set of words that best represented by the given Venn diagram is shown below:
1) Students, Part-time workers, Girls - As girls can be both students and part-time worker. Students can be both part-time workers. Part-time workers can be both students and girls.

2) Engineers, Illiterates, Urban residents - engineers can not be illiterates. ⇒ Option - 2 eliminated
3) Females, Mothers, Sisters - Mothers and sisters will come inside females. Mothers can be sisters ⇒ Option - 3 eliminated
4) Mammals, Human beings, Reptiles - Human beings will come inside mammals. Reptiles is different from both human beings and mammals ⇒ Option - 4 eliminated
Hence, "Students, Part-time workers, Girls" is the correct answer.
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