Which of the following sentences is punctuated correctly?
A. A carpenter must use certain tools - hammers, saws, chisels - to finish a job.
B. A carpenter must use certain tools hammers, saws, chisels- to finish a job.
C. A carpenter must use certain tools, hammers, saws, chisels, to finish a job.
D. A carpenter must use certain tools-hammers, saws, chisels to finish a job.
In Option A, the em dash is used to set off the list of tools (hammers, saws, chisels) from the main part of the sentence. The em dash indicates a stronger break than a comma and helps to provide clarity and emphasis on the list of tools the carpenter must use. The sentence is correctly punctuated, and the tools are appropriately separated by the em dash.
Therefore, the Correct Answer is A.