Robert loves woodworking; one of his favorite projects is baseball bats. He begins by cutting a block of wood into a roughly cylindrical shape. Robert then sands the wood into a baseball bat using a tool called a lathe, a machine with ancient origins that spins the wood at various speeds. [1] Next, Robert further sands down the baseball bat to ensure a smooth and even surface. Once the process is finished, Robert stains the bat. signs it, and sends it off to smash some home runs.
The writer is considering deleting the phrase "a machine with ancient origins that spins the wood at various speeds" from the preceding sentence. Should the phrase be kept or removed?

A. Kept, because it further illustrates the variety of steps in bat construction.
B. Kept, because it is relevant to the paragraph's focus on the use of tools in creating baseball bats.
C. Removed, because the creation of the bat is less important to the paragraph's focus than the sale of finished bats.
D. Removed, because it is an unnecessary specific detail in a general paragraph about bat construction.