I think it's C. Luisa loved riding horses, but she was afraid of the foxes that sometimes jumped out of the trees and scared her horse.
Explanation:
The word riddingin the original sentence means to get rid of, to free something. But the word riding means to ride something, in this situation it's Luisa riding horses.
The rest are things that you need to write down as you do your research: document the source title, the author, the web address, and also any important points that you might find.
