What was the main contribution of the book to the research conducted by the students? The book helped the students choose the general and specific...

What was the main contribution of the book to the research conducted by the students?

The book helped the students choose the general and specific object of the research.
The book helped the students choose the form of data collection and subjects.
The book helped the students understand the social context of the classroom and the teacher's practice.
The book helped the students conduct a semi-structured interview with their research subjects.
a) Only I and II are correct.
b) Only III and IV are correct.
c) Only I and III are correct.
d) Only II and IV are correct.
e) All statements are correct.