Is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the murmur of the waves, the feel of the sand, and the warmth of the sun are all very relaxing. a.
run-on sentence

b.
compound sentence

c.
simple sentence

Today’s readers have more scientific knowledge than readers of previous eras what effect does that have on their reading of science fiction stories

Which of the following best combines and shortens what happens in paragraphs 1-3

In which type of essay would you expect to find the following passage? during the civil war, the economies of the northern and southern states differed: the north was industrial, while the south was agricultural. while sometimes these interests allowed for mutual economic goals, they also contributed in part to the conflict that fueled the onset of the civil war.