Discussion

Explanation:

The “subsumption relation” refers to a definite entity. Hence, it must take the definite article “the”. This eliminates options 1, 3 and 4.
A demonstrative pronoun is required to attribute to the forms of “hierarchies of classes, class definitions and the subsumption relation”. Thus, the correct pronoun to use would be “these”. Eliminate option 2 with “such”.
Hence, the correct answer is option 5.

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