A:
This computer comes with AMD Radeon R7 250 graphics which is a very decent graphics card, but it isn't 1 of the top graphics card. It will run MC no problems but the FPS depends on the Resource Packs you are planning to use, for example it'd run between 40 and 80 on a x64 HD resource pack but between only 40 and 60 on a x128 HD resource pack. There is no answer to that
BF 4 would run at about 35-45 on med-high (as I said, it isn't 1 of the top graphics card that this computer comes with) playable but not the most outstanding performance ( as can be seen in this video https://www.youtube.com/watch?v=yB02GuE2cis)
BF3 would run between 45-60 on medium-high
skyrim unmodded should run roughly same as BF3.
Sims 3 and 4 aren't very demanding so u should be good there as well.
best of luck