If $X, Y$ and $Z$ in figure are identical lamps, which of the following changes to the brightnesses of the lamps occur when switch $S$ is closed?
If $X, Y$ and $Z$ in figure are identical lamps, which of the following changes to the brightnesses of the lamps occur when switch $S$ is closed?
- A
$X$ stays the same, $Y$ decreases
- B
$X$ increases, $Y$ decreases
- C
$X$ increases, $Y$ stays the same
- D
$X$ decreases, $Y$ increases
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