Correct! The answer here is d.
The skill here is verb agreement or proper verb form. Of the choices given, the only word that fits with "Mr. Wilson" is "plans." A good way to get this answer is to hear how the other choices don't sound right. This might be hard if you're not that confident with the language yet. With verb forms, often the "s" at the end connects with a singular noun. This gets confusing because we normally associate "s" with plurals. It's as if it's the opposite with verbs.