Which type of orbitals overlap with each other in benzene?

What is the number of $\sigma$ and $\pi$ bonds in the resonance structure of benzene?

Assuming the bond direction is along the $z$-axis,which of the following overlaps of atomic orbitals of two atoms $(A)$ and $(B)$ will result in bonding?
$I$. $s$-orbital of $A$ and $p_x$-orbital of $B$
$II$. $s$-orbital of $A$ and $p_z$-orbital of $B$
$III$. $p_y$-orbital of $A$ and $p_z$-orbital of $B$
$IV$. $s$-orbital of both $(A)$ and $(B)$

Nodal planes of $\pi$-bond$(s)$ in $CH_2=C=C=CH_2$ are located in

Which of the following combinations does not form a $\sigma$ bond?
$(i) \ 2p_y - 2p_y$
$(ii) \ 2p_z - 2p_z$
$(iii) \ 2s - 2p_x$
$(iv) \ 2p_x - 2p_x$

Which of the following represents the nodal plane in the $\pi$-bond of ethene $(C_2H_4)$?