Will bonding molecular orbital be formed?


> 
> Which of the following statements is not correct regarding bonding molecular orbitals?  
> 
> **A** Bonding molecular orbitals possess low energy than the atomic orbitals from which they are formed;  
> 
> **B** Bonding molecular orbitals have low electron density between the two nuclei;  
> 
> **C** Every electron in bonding molecular orbitals contributes to the attraction between the atoms;  
> 
> **D** They are formed when the lobes of the combining atomic orbitals have the same sign.
> 
> 
> 


I am confused about option **D**, I think this should be right as same sign means lobes are in the same phase, so they should form BMO. But the answer key states that the statement is incorrect.


Can anybody please explain me this and is my reasoning correct?


