Final answer:
Without additional information or context, the minimum possible coefficient of static friction between the bike tires and the ground cannot be determined from the given options.
Step-by-step explanation:
The minimum possible coefficient of static friction between the bike tires and the ground cannot be determined from the provided options (a) 0.5, (b) 0.2, (c) 0.8, (d) 0.3 without additional context or specific information about the situation, such as the grade of the road, the weight of the bike and rider, or the speed and radius of a curve. To find the minimum static coefficient of friction, one must apply physical principles, typically involving Newton's laws of motion and equations related to circular motion for cases involving unbanked curves.
For example, if we consider a car negotiating an unbanked curve, the formula that relates the coefficient of static friction (μ), the velocity of the car (v), the radius of the curve (r), and acceleration due to gravity (g) is μ = μ_{min} = μ = v^2/(rg). Using this equation, if we know the speed at which the vehicle is traveling and the radius of the turn, we can solve for the minimum static coefficient of friction that is required to prevent slipping. However, without specific numerical values and a clearly defined problem, we cannot accurately determine which option is correct.