Four metals $J$, $K$, $L$ and $M$ are each placed separately into aqueous solutions containing their ions. The observations are shown. Which statement about the metals is correct?
- A$J$ has a greater tendency to form positive ions than $K$.
- B$L$ has a greater tendency to form positive ions than $J$.
- C$K$ has a greater tendency to form positive ions than $L$.
- D$M$ has a greater tendency to form positive ions than $K$.