Question 18N.1.SL.TZ0.27

The following interaction is proposed between a proton and a pion.

p⁺ + $\pi$^– → K^– + $\pi$⁺

The quark content of the $\pi$^– is ūd and the quark content of the K^– is ūs.

Three conservation rules are considered

I.   baryon number

II.  charge

III. strangeness.

Which conservation rules are violated in this interaction?

A.   I and II only

B.   I and III only

C.   II and III only

D.   I, II and III