The correct answer is A. ugly.
The man had transformed the courtyard into a junkyard, all he ever planted in it was trash. This is an example of something that is ugly. Ugly is defined as unpleasant to look at or hear. In this case, the man has taken something that is beautiful (a courtyard) and turned it into something that is ugly (a junkyard). This is because he has planted trash in it, which is not something that is pleasant to look at.
The other options are not correct. Baseless means without foundation or support. Splendid means very beautiful or impressive. Nonsense means something that is foolish or ridiculous. In this case, the man’s actions are not baseless, splendid, or nonsense. They are simply ugly.