What do the settings in the SoX dialogue box do?
(1) Passband.
(2) Phase response.
You should be fine with the settings in the image you've provided.
Passband is given as a percentage of the Nyquist frequency.
So in your screenshot, 0.95 * 48000/2 = 22.8 kHz.
This is the corner frequency of the low-pass filter used by the resampling algorithm.
Phase response is a selector for minimum or linear phase filter (impulse response) characteristics.
I would leave it at "linear".
EDIT: you never answered
why you are resampling.