Step 1: Read the question.
We must identify the scientists who cloned Dolly the sheep, the first mammal cloned from an adult cell.
Step 2: Recall the event.
Dolly was born in 1996 at the Roslin Institute in Scotland using somatic cell nuclear transfer.
Step 3: Recall the lead scientists.
The work was led by Sir Ian Wilmut and Keith Campbell.
Step 4: Eliminate Watson and Crick.
Watson and Crick described the DNA double helix in 1953, which is unrelated to cloning, so any option naming Watson is wrong.
Step 5: Eliminate the mixed options.
Options pairing Campbell or Wilmut with Watson are incorrect because Watson had no role in Dolly.
Step 6: State the answer.
The correct team is Wilmut and Campbell, option A.
\[ \boxed{\text{Team Wilmut and Campbell}} \]