Multiple Choice questions- Grammar help needed!?

Question

I was having difficulty with some of these- can you help?
Directions: For each question, select the best answer to replace the parentheses.

1. (In the preface to the book, it explains) why the study of economics is indispensable for anyone interested in a career in politics.

A. no error
B. It explains in the preface to the book
C. The preface to the book explains
D. It explains, the preface to the book,
E. There is an explanation in the preface of the book to

2. Things Fall Apart, Chinua Achebe' s novel of village life in nineteenth-century Nigeria, (is studied frequently in both high school and) college literature courses.

A. no error
B. is a frequent studied novel in both high school and
C. studied frequently both in high school as well as in
D. frequently is studied by both high school and also in
E. are frequently studied in hgih school as well as

Answer 1

Preface
A unnecessary comma
B missing commas
C simple direct so best choice
D missing preposition
E Good, but more wordy than C

Novel
For this take out the adverb
A , is studied in both high school and
B, is a studied novel in both high school and
C, studied both in high school as well as in
D, is studied by both high school and also in
E are studied in high school as well as

I hope this helps to clarify the problem

Answer 2

B. It explains in the preface to the book
B. is a frequent studied novel in both high school and

Answer 3

To replace the parentheses:
1.Choose C
2.Choose D
That will get rid of your parentheses.
I must admit,I had to look at question two a few times.But in question two,answer D uses a comma insertion that takes away the parentheses.Remember that commas,dashes and parentheses can serve the same purpose.Use commas and it is solved.
Do you have any typos,please check to make sure.If you do not,then these are the right answers.

Answer 4

C

B if you meant to type 'is a frequently studied novel in both high school and'

Answer 5

first one C
second one about the novel is A or B if you use 'frequently' instead if 'frequent'

Answer 6

C A

Answer 7

I'd go with C and A.