The structural formula for alliin is displayed. What are the approximate bond angles $x$, $y$ and $z$ in an alliin molecule?
- A$x = 90^\circ,\ y = 90^\circ,\ z = 109^\circ$
- B$x = 120^\circ,\ y = 109^\circ,\ z = 90^\circ$
- C$x = 120^\circ,\ y = 120^\circ,\ z = 109^\circ$
- D$x = 180^\circ,\ y = 109^\circ,\ z = 109^\circ$