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.
The 2nd choice is the most engaging
The school suspended Tinker and her classmates for wearing the armbands. They were only allowed back in school after they removed the black armbands.
Casual form, hope this help!☺️
