Answer is B. She is the person whom he had found sleeping in the library.
A. That author is the one who I saw at the bookstore today.
A would have been correct if it had the word 'whom' instead of who.
B. She is the person whom he had found sleeping in the library.
Its the correct option.
C. Against who did you think you would compete in the contest?
This word 'whom' is supposed to be used here in the place of who to make it correct.
D. The musical group whom won the top prize are from my hometown.
The use of the word 'whom' here makes the sentence incorrect.
In Alice Walker's "Everyday Use", the event that the mother recalled when she thought about Dee was how Maggie perceived Dee's life to be plentiful of ease and convenience and that Dee was prized with a life where she was free to do or to be whatever she wanted.
The answer is Secured credit card. It is used to pay the needed materials but she needs to pay it every month. This has interests so she needs to consider her debts and the profit she can get from her business.
The new movie in the theater captivated the audience.
This machine can simulate or imitate the human voice.
Use precise and exact measurements in your lab.
Her treatment was complicated because of her allergy to the medicine and so she arrived home a week later.
Hope this helps :)