D is the only sentence with the correct usage of quotation marks.
<u><em>This is a dactylic.</em></u>
<u><em></em></u>
<u><em>Hope you get good marks and good luck!</em></u>
Things that should be avoided are phrases like:
in my opinion
i think
i believe
and definitives like: completely, never
It expresses the many types of English the Tan family uses.