1. I am not sure why I can't go to the movies.
I don't eat ice cream because I am lactose intolerant.
2. The book's cover was blue and white.
3. The students' grades were at an all-time low.
The children's toys were across the room.
4. She got three A's on her report card.
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The correct answer is A. reliable.
The writer was 'an authoritative source' because of her degrees, guest appearances, etc. Thus, she was a source you could rely on, she was reliable, given that she had experience to back her ideas up. Therefore A is the only correct answer.
???? Is this a question or what do I need to answer?