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.
Skill Practice I
Skill Practice II