Please choose the correct solution to the question: how to clean pennies with Coca Cola

Solution1: pour some coca cola in a cup, just enough to cover the penny and drop the penny in  When the copper oxide (the pennies) and the phosphoric acid (the cola) get together in the bath, the acid reacts with the copper oxide on the pennies and dissolves it. That's why the pennies get shiny.

Solution2: pour some coca cola in a cup, just enough to cover the penny and drop the penny in  When the copper oxide (the pennies) and the phosphoric acid (the cola) get together in the bath, the acid reacts with the copper oxide on the pennies and dissolves it. That's why the pennies dissolve

Answer format: solution1/solution2
Answer: solution1