In a cross between a red flowered plant and a white flowered plant, all offsprings produced bear pink flowers. This is because

The correct option is D Red and white exhibit incomplete dominance
When a red flowered plant is crossed with a white flowered plant, ideally the offsprings should bear either red and white flower. However, in the case where the trait flower color exhibits incomplete dominance, all the offsprings will give forth pink colored flowers due to the blending of traits.