Can fly but have no wings. i can cry but i have no eyes. wherever i go, darkness follows me. what am i? i will give brainiest if you get it correct

Why does lightning travel from clouds to the ground? a. the negatively charged ground attracts the positive charge from the clouds b. charges are exchanged between negatively charged clouds and positively charged ground c. gravity pulls the negatively charged energy from clouds downward d. gravity pulls the positively charged energy from clouds downward