For a gap that is $0.85\,\text{m}$ wide, which wave undergoes the greatest diffraction?
- Awave speed $300\,\text{m s}^{-1}$, wave frequency $280\,\text{Hz}$
- Bwave speed $300\,\text{m s}^{-1}$, wave frequency $400\,\text{Hz}$
- Cwave speed $350\,\text{m s}^{-1}$, wave frequency $280\,\text{Hz}$
- Dwave speed $350\,\text{m s}^{-1}$, wave frequency $400\,\text{Hz}$