Final answer:
The typical vertical ground reaction force during running is approximately B. GRF = 2 x body weight, which includes the force to support and propel the body.
Step-by-step explanation:
The typical vertical ground reaction force (GRF) during running is commonly more than the body weight of the individual. When you run, each foot strike generates a GRF that can be multiple times your body weight due to the added force of your downwards momentum and the need to support and propel your body forward. In most cases, the GRF can be around two to three times your body weight, depending on the speed and style of your running, among other factors. Therefore, given the options, the closest typical value for GRF during running would be B. GRF = 2 x body weight. This value takes into account not only the force needed to support the body's weight against gravity but also the additional force exerted by the body to facilitate running motions.