Does τοῦ modify πλείστους or does it modify ἀποθνῇσκειν? If the former, what word does ἀποθνῇσκειν modify and what case is it? If the latter, does πλείστους modify ἀποθνῇσκειν as an adjective or is it the substantive subject of it despite not being accompanied by an article?καὶ διὰ τοῦτο ἡ Ἔρις αἰτία γίγνεται τοῦ πλείστους τῶν ἐν τῇ Ἑλλάδι καλῶν καὶ ἀγαθῶν ἀποθνῇσκειν.
The answer key gives
And because of this, Strife becomes responsible for the fact that very many of the fine and noble men in Greece die.