400 videos . . . . . . already . . . . . . by Angel for English on YouTube.

A. are , uploaded

B. have , uploaded

C. are been , uploaded

D. have been , uploaded

Answer: Option D

Solution(By Examveda Team)

Sentence is in present perfect tense with passive voice.
Rule :
Subject + have/has + been + V³ + other agents.
400 videos have been already uploaded by Angel for English on YouTube.