Peak performance can best be achieved when:

I will go for ............... A............

Of course All of the above are equally important.

I will go with (d). All of these factor help toward achieving peak performance.

I believe it is D as Peak performance cannot be achieved unless all parties, manager and employees are committed to reaching same goals that encourages peak performance.

My answer is option (D)  All of the above

Peak performance can best be achieved when:

 d. all of the above.  

>>>>>>>>>>>>>>> d. all of the above.  >>>>>>>>>>>>>>>>>>>>>

All the listed factors are essential for the peak performance.