As Shown in the Figure, Two Solenoids Are in Line $S$

Multiple Choice

As shown in the figure, two solenoids are in line. The switch S, initially closed, is suddenly opened. Just after opening $S$ , what is the polarity of the induced emf in terminals $X$ and $Y$ ?

A) $Y$ is positive and $X$ is negative.
B) $X$ is positive and $Y$ is negative.
C) $X$ and $Y$ are at the same potential.