Which among the following overlap will give strong bond?

Hybrid orbitals form strong bonds than the pure atomic orbitals.

Therefore p-p overtapping gives least stable bond among the given options.

In second, thrid and fourth options the bond is formed by overlapping of hybrid orbitals, hence it is stable.

as the percentage of s-character increases ,size of orbital increases ,hence extent of overlapping increases.

Where as in first option bond is formed by overlapping of pure atomic orbitals, hence it is unstable.