The position of a topic sentence often shifts according to the author and writing style where is the one place topic sentence should never be

The position of a topic sentence often shifts, according to the author and writing style. One should never place the topic sentence in the middle of the paragraph. It will just give your reader confusion what really the paragraph is talking about. You can place it either in the beginning or at the end of the paragraph.

I'm going to say the correct answer is A