Final answer:
The sphere with a positive charge released from rest will experience a force due to gravity. It doesn't experience a net force from its own electric field, and the relevant equation F = qE applies only when an external electric field is present.
Step-by-step explanation:
The correct answer to the question of what force a very small sphere with a positive charge of q=8.00C released from rest will experience due to its own property is: (d) Gravity. This is due to the fact that a charged object does not experience a net force due to its own electric field, and mass and acceleration do not directly exert a force. Instead, the gravitational force, which is based on the object's mass, will act on the sphere pulling it towards Earth.
The equation F = qE can be used to calculate the force on a charge in an electric field, where F is the force, q is the charge, and E is the electric field. However, when only gravity is acting on the sphere, this formula does not apply since there is no external electric field acting on the charge.