Only P-waves reach the side of Earth that is opposite the focus because P-waves option 4: can travel through liquids and S-waves cannot.
A P wave is known to be a compressional wave. This is seen as a kind of a seismic body wave that often moves or shakes the ground a lot in the same direction and also in its opposite direction as the wave moving direction.
Note that the P waves can be able to move via liquid and solids and gases, but the S waves can only move through solids.
Hence, Only P-waves reach the side of Earth that is opposite the focus because P-waves option 4: can travel through liquids and S-waves cannot.
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