The bolded word here is the BESTSELLER. This kind of complement is a direct object complement. The adjective overnight denotes to the object bestseller which is an adjective. Another adjective complements another adjective, thus, the term direct object.
Explanation:
number c is the best that describes the theme
<span>It was combined with the theory of continental drift to form one unified explanation. </span>
<span>Based on the descriptions given, the inference that can be made is that although East Egg is the more fashionable place of the two, the way it appears on the surface is different compared to what it really is. Even though its glitzy with the white palaces that glitter along the water across the courtesy bay, it somewhat gives you a sense of foreboding that there’s more to it once you get past the doors of those palaces.</span>
