Identify the incorrectly punctuated sentence.

a. Be careful not to mix household cleaners, for that can be dangerous.
b. I will wash the windows, and you clean the floors.
c. The windows have been washed, but they still look dirty.
d. This product is, for cleaning glass.***

Right again.

d. This product is, for cleaning glass.

d. This product is, for cleaning glass.

To identify the incorrectly punctuated sentence, we need to review the provided options.

a. "Be careful not to mix household cleaners, for that can be dangerous." - This sentence is correctly punctuated. It uses a comma before the coordinating conjunction "for" to separate the two independent clauses.

b. "I will wash the windows, and you clean the floors." - This sentence is correctly punctuated. It uses a comma before the coordinating conjunction "and" to separate the two independent clauses.

c. "The windows have been washed, but they still look dirty." - This sentence is correctly punctuated. It uses a comma before the coordinating conjunction "but" to separate the two independent clauses.

d. "This product is, for cleaning glass." - This sentence is the incorrectly punctuated sentence. It includes an unnecessary comma before the preposition "for," causing a punctuation error.

The incorrectly punctuated sentence is d. "This product is, for cleaning glass." To correct it, the comma should be removed.