The correct answer is: with.
The word “endowed” means “to provide someone with something, especially something valuable or desirable.” In this sentence, Kanak is being described as someone who has been given many great qualities. The preposition “with” is the most common way to express this idea.
The other options are incorrect because they do not make sense in the context of the sentence. The preposition “in” is used to express location or position. The preposition “of” is used to express possession or association. The preposition “by” is used to express agency or cause.
In conclusion, the correct answer is “with.” This is because the preposition “with” is the most common way to express the idea of providing someone with something, especially something valuable or desirable.