What is the difference between the i and a commands of the vi editor?

What is the difference between the i and a commands of the vi editor?
A . i (interactive) requires the user to explicitly switch between vi modes whereas a (automatic) switches modes automatically.
B . i (insert) inserts text before the current cursor position whereas a (append) inserts text after the cursor.
C . i (independent rows) starts every new line at the first character whereas a (aligned rows) keeps the indentation of the previous line.
D . i (interrupt) temporarily suspends editing of a file to the background whereas a (abort) terminates editing.

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Answer: B