Quiz: Component Count

Road Construction: You add $m$ roads one by one. After each road, report the number of connected components. Initial components = $n$. You add edge $(u, v)$ where $u$ and $v$ are in different components. New component count?

1. A.Stays the same
2. B.Decreases by $2$
3. C.Decreases by $1$
4. D.Increases by $1$