Which is the best way to revise the final sentence?

The transition “in fact” should be added to the beginning of the sentence to show the similarity among ideas in the paragraph.
The transition “as a result” should be added to the beginning of the sentence to sum up the argument in the paragraph.
A quotation should replace the sentence to further support the argument in the paragraph.
A fact should be added to the sentence to further support the argument in the paragraph.