Which of the following orbital pairs would form a linear combination resulting …

Which of the following orbital pairs would form a linear combination resulting in a σ\sigmabond? The internuclear axis is the z-axis.

I. 2s ,2pxI.\ 2s\ ,2p_x
II. 2py,2pyII.\ 2p_y,2p_y
III. 2pz,2sIII.\ 2p_z,2s
IV. 2s , 2sIV.\ 2s\ ,\ 2s
V. 2px,2pxV.\ 2p_x,2p_x
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