On the first try I got 12/14. I switched the two I was unsure about and got all 14. (I was wrong on 15 all throughout but it was "bonus".)
1) The cobblestone on the ground is obviously a video game texture.
2) The reflection on the windshield is a bit off and there was something wrong with the buildings in the background, but I wouldn't determine what.
3) Same bad cobblestone texture.
4) The reflection on the hood of the car is unrealistic.
5) The reflection from the hood is too sharp, clear coats just don't look like that.
6) Ditto on the reflection from the glass.
7) This was a toss up, very good. I had to guess.
"A" is not on a racetrack, so I figured it was the real-world image.
9) "A" is not on a racetrack, and I figured that a real Ferrari would have matched break calipers, not yellow break calipers on a red car.
10) The wheels show no motion blur but the background shows considerable motion blur.
11) "A" looks like it is a picture of a TV running the game, so I called shenanigans on it.
12) Very hard to tell which one was the game and which one was real life.
13) Again looks like it was a picture of a TV running the game.
14) The car is obviously in motion yet the wheels do not have any motion blur.