Put the following steps to form lightning in order: A. Connection between positive streamers and stepped leaders, therefore creating a lightning strike B. Positive charges flow upward toward the cloud C. Negative charges from the cloud base stream down towards the surface, forming stepped leaders D. Collisions between ice particles and liquid droplets cause charge separation within the cloud  () B, D, C, A () D, B, C, A () D, C, B, A () C , A , B , D