It is necessary because if you don't have a confirmed opinion with textual evidence to back it up you wont have a good argument.
All of these are subjective except C which is a 100% verifiable fact
a)taste in music is subjective
b) many people think videogames aren't too violent (opinion)
d) this is somebody's opinion
Answer:
Quickly Ran
Explanation:
because it expresses an adjective
Try getting easybib it formats it for you