💡 Detailed Explanation
The correct answer is 「のみならず」 (nominarazu), meaning 'not only... but also'. It is a formal written equivalent of 「だけでなく」. 「ばかりか」 also means 'not only' but is used when adding something even more surprising or extreme. 「どころか」 means 'far from/on the contrary'. 「はおろか」 means 'let alone... (not even the base level)'.