All but one of the following arguments are equivalent in the sense that each offers the same premises in support of the same conclusion. Which argument is not like the others in this respect?

Group of answer choices

Sherlock conked Moriarty or Watson shot Moriarty, but Watson didn’t shoot him, so Sherlock conked him.

Sherlock conked Moriarty, for either that happened or Watson shot Moriarty, and Watson diidn’t shoot him.

Watson didn’t shoot Moriarty, so Sherlock conked Moriarty, as either Sherlock conked him or Watson shot him.

Sherlock conked Moriarty or Watson shot Moriarty, thus Watson didn’t shoot him, given that Sherlock conked him.