Answer:
D. He or She
Explanation:
We can figure this out by using the standard order of elimination to see which one of the options makes sense. All of the words except for option D. are either much too vauge, don't make sense, or are grammatically incorrect.
You forgot the period. And The capital "c". I don't know what type of question this is so I just helped with the grammar!
Answer:
D) My sister, who exercises every day, is coming over for dinner.
It’s an adjective because it’s describing it
