What is the difference between primary purpose and main point of the passage?

Question

Answer 1

Main Point: what passage?
Primary purpose: Why passage?

Answer 2

Main Point: what passage?
Primary purpose: Why passage?

Answer 3

today schedule class on main point of passage not found in reading comprehension in learning module

Answer 4

today schedule class on main point of passage not found in reading comprehension in learning module

Answer 5

Main point: often refers to the idea being conveyed
Primary purpose: the reason behind the author writing the passage

Answer 6

Main point: often refers to the idea being conveyed
Primary purpose: the reason behind the author writing the passage