Which sentence has no errors?
A.
When we got to our campground, it was only mid-morning, but the campsites were already filling up fast.
B.
When we got to our campground, it was already crowded, and we knew we should have left earlier.
C.
When we got to our campground, there were people everywhere trying to grab a campsite.
D.
When we got to our campground, most of the campsites were already taken by people who got there earlier.