Click on the box to choose whether the sentence is correct (C), contains a comma splice (CS), or is a fused sentence (FS)
Don't stack twelve boxes on top of one another, it's the twelfth one that will knock down the pile.

It contains a comma splice.

Explanation:

"Don't stack twelve boxes on top of one another" and "it's the twelfth one that will knock down the pile" are independent clauses and should be linked by a colon, semicolon, or conjunction.

●intensive purposes is the correct answer

what is this from, i cant tell what language he uses without the piece of literature