At point b, in demonstrated figure the supply curve into this graph is: (w) perfectly elastic. (x) elastic, but not perfectly that why. (y) unitarily elastic. (z) inelastic.
![327_Price Elasticity of Supply3.png](https://secure.tutorsglobe.com/CMSImages/327_Price%20Elasticity%20of%20Supply3.png)
Can anybody suggest me the proper explanation for given problem regarding Economics generally?