Which sentence has the better grammar?

I am kind of stuck between these two questions. Can you help me determine which is the right choice? I answered b and a respectively, however, I don’t feel confident on my answers.

1.
a. I hurriedly placed the books, which I had brought back from the library, on the bedside table.

b. Hurriedly, I placed the books on the bedside table which I had brought home from the library.

c. I brought back from the library books I hurriedly placed on the bedside table.

d. I hurriedly placed the books on the bedside table which I had brought home from the library.

2.
a. Nurses do a necessary job: doing what the doctors tell them to cure the patients and making them feel better.

b. Nurses do a necessary job, and doing what the doctor tell them to cure the patients and making them feel better is their business.

c. Nurses do a necessary job. They do what the doctors tell them, to cure the patients and to make them feel better.

d.It is the nurses’ job to do what the doctor tells them to cure the patients and make them feel better, and their job is necessary.