C. A heavy rainstorm.
The text shows indication of a storm arriving. “Clouds arrived” are an indicator that clouds quickly appeared. “Lightning flashed” tells us these are storm clouds. It makes sense that next it would start raining, making the next event a heavy rainstorm.
The most fitting answer would be C. while and however
read it then go back look through the story and find your answer good luck
I'm pretty sure its both so its
a compound subject and a compound verb