Awell written paragraph without a stated topic sentence has

an implied main idea.

Explanation:

A well-written paragraph can be defined as the one which gives an introduction to the main idea and the theme of a paragraph.

If a paragraph has no topic sentence, then it should be written in such a manner that the reader is able to grasp the idea of the main theme of the paragraph. A well-written paragraph should stick to the main idea from start to end.

A well-written paragraph have certain elements and by checking to these elements one can check if the paragraph is well written or not:

So, the correct answer is an implied main idea.

the answer is d. she became an english professor at university of georgia.