The incorrectly punctuated sentence is A. We went to the store but we forgot to buy eggs.
This is known as the use of spaces, signs and the use of various typographical tools to aid the understanding and correct reading of a written text.
Hence, we can see that the option A is incorrectly punctuated because the sentence is without a comma. The comma should come right after the word store as that is a simple sentence, to correctly make it a compound sentence, a comma is added and the rest of the sentence follows.
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