The announcementon unveiling(A) the new smartphone modelwho introduced(B) advanced features and technology, to become the devicewith most(C) sales in its category,had impressed(D) the tech community.

Katawho introducedtidak tepat karenawhodigunakan untuk orang, sedangkan klausa relatif disini merujuk pada “smartphone model” (Bukan orang). Katawho introduceddiubah menjadiwhich introduced.Jawaban: B