Final answer:
The correct answer is option 3) accelerating too quickly, because when you are taking a turn in a vehicle, you are experiencing acceleration due to change in velocity which includes direction.
Step-by-step explanation:
When you are taking a turn in a vehicle, even if you are maintaining a constant speed, you are experiencing acceleration. Acceleration is not just the increase or decrease in speed, but also any change in velocity, which includes direction. On a curve, if you accelerate too quickly, you add to the outward force, often referred to as centrifugal force, that is trying to push you away from the center of the turn. This force is a result of your body's inertia and the car's change in direction, as described by Newton's first law of motion. Braking suddenly or turning the steering wheel too sharply also disrupt the controlled curve, potentially causing a loss of traction. However, the question directly relates to the sense of acceleration felt during a turn, hinting that option 3) accelerating too quickly is the missing cause of losing traction on a curve.
It is important to note that actual centrifugal force does not exist; what is felt is a result of the inertia of the moving car trying to maintain its straight path while it is being redirected by the turn.