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
"<span>to remind staff about a workshop" would be a good situation in which it would be </span>most appropriate to send a memorandum, since memos are used for relatively insignificant things.
I believe it to be A for when you compared yourself to others you are finding your strength and weaknesses compared to that person which allows you to understand what you need to work on as well as you can find more allies easier this way.
The total amount resulting from the addition of two or more numbers, amounts or items.