I voted "partially." The reason for that is that the first option which states that stats determine personality is just incorrect. You can have 20 people with an int of 13, wis of 11, cha of 17 that all have different personalities. Stats don't determine personality.
Stats do influence roleplay, though. An 8 int, regardless of anyone's justifications, is just factually in the game a dumb character. The 3 intelligence genius arguments are bupkis. The game rules state what int represents and a low int = low mental acuity, low accuracy of recall and low ability to reason. The same goes for every stat. They all mean something and low numbers mean you are not as good at that something, where high numbers mean that you excel at it.
That said, I have noticed in life that intelligence is primarily processing speed. One of the guys I used to play D&D with back in junior high and high school was probably at an 8 or 9 intelligence. What would take me seconds to figure out, would sometimes take him minutes to days(he would think of things during the down time in-between games) to figure out. It took him a while, but he usually got there. So when I play a low int PC, I will often roleplay him as unable to think of the solution to a situation, especially if there are external pressures that make concentration difficult. Sometimes, though, he has a flash of inspiration or the situation takes long enough for him to reason through to a solution.