Out of all the pronouns, "whom" makes the most sense grammatically. This allows us to narrow it down to A or D.
In order for it to be the object of a preposition, there would have to be a preposition in front of it. "For," however is <em>not</em> a preposition. In fact, there isn't a preposition in the whole question.
This leaves us with option D, which is the correct answer.
You can better tell it's a direct object if you flip the sentence around a bit.
Your sister is waiting <em>for whom</em>?
"Whom" is essentially receiving the action. "Whom" is what your sister is waiting for.
Answer: D. whom; direct object.
B.
These gift bags are for: Mrs. Hernandez, Mr. Rollins, and Miss Crane.
A colon NEVER comes after a fragment, only after a complete clause.
Answer:
D: Civil War
Explanation:
They didn't start a Civil War they just fought back and forth
Answer:
His Motorola Cell Phone was presented as exhibit A.
Explanation:
2 is b the knight rode bravely into the woods
