The answer is: ______________ "no error". ________________ The comma is correctly placed before the conjunction "for"; and in this instance in which the word, "for", is used, a comma is necessary. No other part of the sentence needs—or requires—a comma, and there are no commas that are placed unnecessarily. ________________________________ As a side note, I would recommend that the first letter of the first word in the sentence: "Abbey", be capitalized, because: ________________________________ 1) It is the first word at the beginning of the sentence; and: 2) It is someone's name, which is a proper noun. __________________ I also recommend placing a "period" at the end of the sentence. ___________________________ To read: ___________ <span>Abbey is most interested in learning how to mount her horse, for she already knows several things about dressage. ____________________________</span>