He is very poor. He wears expensive
watch.(but)

He is very poor but he wears expensive watch.

He is very poor, but he wears an expensive watch.

I placed the word "but" after the factual statement that the subject is very poor because the purpose of this sentence is to display the contradiction between the person's financial background and the other fact that he wears an expensive watch.

the thesis statement : d

b. failure at least that one seems the most negative out of all of the answers provided pls correct me if i'm wrong. : ))