Final answer:
The relation R={(1,5)(3,6)(3,5)(4,6)} is correctly represented by the option C) {(1, 5), (3, 5), (3, 6), (4, 6)}, which lists all the ordered pairs contained in the relation.
Step-by-step explanation:
To write the relation R={(1,5)(3,6)(3,5)(4,6)} in the descriptive method, you need to describe the set of ordered pairs using a rule or a condition that identifies the elements of the relation. In the context of a relation, the descriptive method typically provides information about the relationship between the first and second elements of the ordered pairs. However, given the options and the information provided in the question, all of the options are essentially the rote representation of the relation R rather than a description. Nonetheless, if you would like to choose an option that correctly lists all the elements of the relation R presented, the correct choice would be C) {(1, 5), (3, 5), (3, 6), (4, 6)}
This option accurately repeats all pairs contained within the relation R without additional rules or conditions, matching the set given in the question. This suggests that the correct way of describing the relation using the choices provided is simply by listing out the relation's elements, which is not the typical use of a descriptive method but aligns with the presented options.