A potential divider is connected to a power supply of voltage $12\ \text{V}$. The resistors $X$ and $Y$ begin with the same resistance. The resistance of $X$ is reduced to half. What change occurs in the output voltage?
- A$-3.0\ \text{V}$
- B$-2.0\ \text{V}$
- C$+2.0\ \text{V}$
- D$+3.0\ \text{V}$